Axle/brake questions

[1bad79]

So I bought a 1984 Chevy k10 truck that appears to have a 1986 gmc frame,a pre 1978 dana 44 3/4 ton front axle and 9.5 inch rear axle with 11 5/32 brakes c clip axles, I’m having trouble finding drums for the rear I’ve looks on rock auto and none of the dimensions seem to match what I have,any ideas approximately what year the axle might be or where I can find some stamped information on it I’ll include pics of any of my information is wrong let me know this is the first 73-87 I have owned thanks Steve

 

[1bad79]

I think I figured it out after about 4 hours I have a 1983 c20 rear axle or at least that’s what the brakes match up to