Looking for a 73-87 Cab & Chassis Rear ... any leads

Hey guys, looking for a cab & chassis rear for my 74 Crew Cab Dually. Any tips on locating one? I tried car-parts.com but don't know which axle code I'd be searching for. Most yards around here are lost when you ask about c&c stuff. Anyone know where any are at in the VA/MD/DC area?

if you don't mind a little drive time I have two of them that I picked up this last week

I have one also...I could check on shipping for it if you would like me too. Just for reference it is about a 24-27 hour round trip from the DC area.