A518 46RH rebuild

Have you figured out the transmission mount for it yet? I will be putting a 518 in my 88 D100 and had thought of maybe trying to scrounge an entire transmission crossmember from a 92-92 D100, D150 or a Ramcharger for my swap. I'm putting a 1998 model 5.9 Magnum in mine and have a line on a 91-93 truck to snag a gas tank from, so maybe I'll get lucky and it will have a crossmember too.