These aren't that hard to find, they pop up on Ebay all the time and aren't Mustang II specific (they also came in the Pinto, Bobcat, Capri, Capri II and earliest fox-body Capris & Mustangs.) Try your local wrecking yards, and if, for some odd reason they don't have it ask them if they do a free parts locator service to see if they can track one down for you.
__________________ 1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".) | 
Help! Where can I find a 2.8L V -6 Bellhousing and flywheel? 
