U6 would probably be the general-purpose 'utility' rom of the time, also used on other Bally pins. I think Star Trek might use a 720 - 30. 720 was the number for Bally's earliest solid-state game, retained with different revision numbers, in this case 30.
Yes i can provide them. Best changed as a set U2 and U6. Also, supplied as 2732 roms that will need jumper changes, as masked roms should be binned anyway.