Conversation Between '86 F150 and Ubroncof150

'86 F150 --- I just bought a 1990 Ford Bronco 4x4. It has a 302ci with 5 speed manual. I believe after research it's a "M5OD-R2 Transmission". Its needing the "adapter housing" between the transmission and the transfer case and bolts to the cross-member.
My Question to you - How hard is it to find that one piece, without buying the whole Transmission as well?