While searching for a way to put a factory '01 CD deck in a friends '97 F-150,I've come across a couple solutions.
1)There is a comany that sells what they call a "retro harness".This company,from what i gather,takes factory plugs(one that plugs into the the newer deck,and another that plugs into the older trucks power and speaker plugs)and puts them together for a "plug and play' set-up.This one sells for around $45.
2)Scosche makes both of these plugs(from what i can tell from the pics,the FD16R plugs in to the deck,and the FD02 IS the plug that fits 86-and-up Fords).From Scosches website,the FD16R sells for around $20,and the FD02 is around $6.
I HAVEN'T tried these yet,but will soon.