Where can I find engine mounting brackets for a 72 2WD with a 350 V8?

[turbobuick1]

Where can I find these? I'm talking about the L-shaped brackets that bolt to the frame and crossmember.

I'm replacing an Olds 455 with a 350 in a 72 2WD C-20 truck, and found out that the these brackets are seriously hacked up.

Any help is really appreciated! I'd like to find brand new ones, but if someone has some used ones lying around, let me know! Pictures are a plus.

Thanks for your help guys! I'm just starting to get into these trucks, so my resourcefulness for finding parts is limited.