Useful chart, borrowed from http://www.pbresource.com/legs.html#most 
[TABLE="width: 719"]
[TR]
[TD="width: 101"]Maker
[/TD]
[TD="width: 112, colspan: 3"]Year
[/TD]
[TD="width: 103, colspan: 2"]Size
[/TD]
[TD="width: 100, colspan: 3"]Notes
[/TD]
[TD="width: 105"]Key
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1962-1968
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]
Single Player Only - Generally Painted
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1968-1983
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Generally Non-Ribbed Painted Dark Gray
[/TD]
[TD="width: 105"]A,G
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1984-END
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Chrome
(Some exceptions)
[/TD]
[TD="width: 105"]D
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1956-1975
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]Single Player Only -Painted usually to 1960
-( Legs used on Multi-Players games vary in length)
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1976-1990
[/TD]
[TD="width: 103, colspan: 2"]27''
[/TD]
[TD="width: 100, colspan: 3"]Non-Ribbed
[/TD]
[TD="width: 105"]C
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1990-1995
[/TD]
[TD="width: 103, colspan: 2"]27''or31''
[/TD]
[TD="width: 100, colspan: 3"]Check Game Manual
[/TD]
[TD="width: 105"]B,C
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1956-1966
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]Single Player Only
-Generally Painted
-( Legs used on Multi-Players games vary in length)
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1966-1987
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Chrome
-Single Player Only(1966-1969)
-( Legs used on Multi-Players games 1966-1969 vary in length)
[/TD]
[TD="width: 105"]A
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1987-1999
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Chrome
(Some exceptions)
[/TD]
[TD="width: 105"]D
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1990-1992
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Grey Ribbed for Games:
Black Rose
Bugs Bunny
CFTBL
Doctor Who
Dr Dude
Harley Davidson
Party Zone
Radical
[/TD]
[TD="width: 105"]I
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1999-2000
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Black
(Pinball 2000)
[/TD]
[TD="width: 105"]E
[/TD]
[/TR]
[TR]
[TD="width: 101"]DE
Sega
Stern
[/TD]
[TD="width: 112, colspan: 3"]
[/TD]
[TD="width: 103, colspan: 2"]??
[/TD]
[TD="width: 100, colspan: 3"]28½'' Legs started chrome(A), then introduced Black(E) and then 30½''(H). Select on basis of manual or consultation with The Pinball Resource or Stern!
[/TD]
[TD="width: 105"]
[/TD]
[/TR]
[TR]
[TD="width: 569, colspan: 10"]Comments:1) Legs very commonly got switched due to ignorance/availability/?. Be careful in using existing legs to make your decision in the replacement style!
2) Legs choice are sometimes dictated by Basement/GameRoom headroom or size of Pinball player.
3) Legs are produced with care, however plating is good commercial quality or better. Some tooling marks are unavoidable. Legs are packed in poly sleeving directly after plating to protect them from handling/shipping damage.
[/TD]
[/TR]
[/TABLE]

[TABLE="width: 719"]
[TR]
[TD="width: 101"]Maker
[/TD]
[TD="width: 112, colspan: 3"]Year
[/TD]
[TD="width: 103, colspan: 2"]Size
[/TD]
[TD="width: 100, colspan: 3"]Notes
[/TD]
[TD="width: 105"]Key
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1962-1968
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]
Single Player Only - Generally Painted
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1968-1983
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Generally Non-Ribbed Painted Dark Gray
[/TD]
[TD="width: 105"]A,G
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1984-END
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Chrome
(Some exceptions)
[/TD]
[TD="width: 105"]D
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1956-1975
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]Single Player Only -Painted usually to 1960
-( Legs used on Multi-Players games vary in length)
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1976-1990
[/TD]
[TD="width: 103, colspan: 2"]27''
[/TD]
[TD="width: 100, colspan: 3"]Non-Ribbed
[/TD]
[TD="width: 105"]C
[/TD]
[/TR]
[TR]
[TD="width: 101"]Gottlieb®
[/TD]
[TD="width: 112, colspan: 3"]1990-1995
[/TD]
[TD="width: 103, colspan: 2"]27''or31''
[/TD]
[TD="width: 100, colspan: 3"]Check Game Manual
[/TD]
[TD="width: 105"]B,C
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1956-1966
[/TD]
[TD="width: 103, colspan: 2"]31''
[/TD]
[TD="width: 100, colspan: 3"]Single Player Only
-Generally Painted
-( Legs used on Multi-Players games vary in length)
[/TD]
[TD="width: 105"]B
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1966-1987
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Chrome
-Single Player Only(1966-1969)
-( Legs used on Multi-Players games 1966-1969 vary in length)
[/TD]
[TD="width: 105"]A
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1987-1999
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Chrome
(Some exceptions)
[/TD]
[TD="width: 105"]D
[/TD]
[/TR]
[TR]
[TD="width: 101"]Bally
[/TD]
[TD="width: 112, colspan: 3"]1990-1992
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Grey Ribbed for Games:
Black Rose
Bugs Bunny
CFTBL
Doctor Who
Dr Dude
Harley Davidson
Party Zone
Radical
[/TD]
[TD="width: 105"]I
[/TD]
[/TR]
[TR]
[TD="width: 101"]Williams
[/TD]
[TD="width: 112, colspan: 3"]1999-2000
[/TD]
[TD="width: 103, colspan: 2"]28½''
[/TD]
[TD="width: 100, colspan: 3"]Ribbed Black
(Pinball 2000)
[/TD]
[TD="width: 105"]E
[/TD]
[/TR]
[TR]
[TD="width: 101"]DE
Sega
Stern
[/TD]
[TD="width: 112, colspan: 3"]
[/TD]
[TD="width: 103, colspan: 2"]??
[/TD]
[TD="width: 100, colspan: 3"]28½'' Legs started chrome(A), then introduced Black(E) and then 30½''(H). Select on basis of manual or consultation with The Pinball Resource or Stern!
[/TD]
[TD="width: 105"]
[/TD]
[/TR]
[TR]
[TD="width: 569, colspan: 10"]Comments:1) Legs very commonly got switched due to ignorance/availability/?. Be careful in using existing legs to make your decision in the replacement style!
2) Legs choice are sometimes dictated by Basement/GameRoom headroom or size of Pinball player.
3) Legs are produced with care, however plating is good commercial quality or better. Some tooling marks are unavoidable. Legs are packed in poly sleeving directly after plating to protect them from handling/shipping damage.
[/TD]
[/TR]
[/TABLE]