They all used the same one. So, find yourself the one with the least rusted bolts holding it up. Or, take a torch to the junkyark and just cut out the rails where the subframe attaches and just worry about the bolts when you get home. That is problaby the best way. Those bolts get locked in there big time. They are a PITA.
Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII
2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.