8.25 Casting Numbers

If the spring perches haven't been moved, it's most likely from an A-Body. Measure the overall width, if it comes in around 57 1/8" from drum to drum, it is most certainly from an A-Body.

The e-brake strut should be easy, the 10" drums will swap from just about anything.

For the kit, tell them you have a '74 Duster with an 8 1/4" rear and they should be able to get you what ever you need.