Chevy P/N's Mr. 70?

[69L78]

I need help identifying these two cast brackets, the p/n's are 351691 and 3995607.

[69L78]

Pic #2

[Alss]

look like AC brackets..dont know what years though

[Mr70]

Those are Ft. & Rear AC compressor mounting braces used on 1976-81 Camaro & Malibus w/almost every small block.