How to tell the difference between crossover/latebay brakes?

[sam@bugeyeddesigns]

I have a set of 5x112 disc brakes and I need to figure out what year they're from.

Can't see any part numbers so is there anything I can measure?

Cheers,
Sam

 

[67panel]

disc dia and thickness ,but dont ask me what as my books are down the unit :roll: