Compatible brake parts for a 1989 Delta 88

Hi I just purchased a 1989 Delta 88 and it needs new brakes, etc. Rotors, drums, pads, the usual.

I was planning on seeing what I could find at a junk yard and was wondering what models are compatible for parts ? Sometimes parts don't change much across a companies line and sometimes they do, so I was hoping someone with some expertise could help me out. Any other sub companies of GM that would work as well ?

Thanks
Brennan