How can I tell what rear brakes I have.

[rs74]

I need to put new shoes on the back and will probably put new drums on as well. This issue is that my 85 came with a 10 bolt and I swapped it out for a 12 bolt. So the SPID sticker doesn't coencide with what is in there now. Can I just take a shoe and drum to the parts store and have them measure them. What about wheel cylinders, axle seals and such.

Is there any type of numbers on the rear end that will tell me maybe what it is. I am not sure what year the rear end even is.