rear crossmember help

[chevroletrucks]

I decided to post this here because in the parts section everyone is offering me help with 2wd parts. I'm looking for a rear crossmember for my 71 gmc project. It is a 4wd, and I dont know if anyone else has run into this but they are different from the 2wd's rear crossmember. I know because I tried to swap it with one I had from a 3/4 ton 2wd that I had. I'm hoping maybe someone has one from a parts truck or parts frame they'd be willing to sell or trade maybe for gmc parts? I have a nice 72 gmc hood, and a decent 72 core support I'd be willing to part with as trade since I'm using a 67 chevy front end. I've attached pictures of the piece I'm looking for, Its obvious why it needs replacement......