I'm putting a new lock on the coin door, and I have two daft questions
1 the bit that holds the lock in place

That slidey bit that looks like an old coke can ring pull, does it go in from the right or left? How far across should it go? It seems a bit crap at keeping it in place tbh, but also is moulded to fit the door it seems

2 the part of the lock that keeps the door closed, I have two options - either it is to the side or up, or it is to the side and down. Which is it, and I'm sure there's a good reason like it shakes loose or something.
So is it A
and 
Or is it B
and 
Cheers fellas
1 the bit that holds the lock in place

That slidey bit that looks like an old coke can ring pull, does it go in from the right or left? How far across should it go? It seems a bit crap at keeping it in place tbh, but also is moulded to fit the door it seems

2 the part of the lock that keeps the door closed, I have two options - either it is to the side or up, or it is to the side and down. Which is it, and I'm sure there's a good reason like it shakes loose or something.
So is it A


Or is it B


Cheers fellas