58 t-bird 9in in a duster

Could be, they listed it as available in Ford Lincoln/Merc intermediate big blocks, full size V8s, mustangs, cougars, falcons, vans, trucks, etc. Some of the 63-77 full size actually used a 9.375 and the 73 and later full size had a 5-on-5 bolt pattern. I thought it was funny the 64 falcon rear is 3/4 in wider than a big ole 57/9 wagon.