ok, my car is a 64 galaxie 500 with an fe. i originally had a open 3.50 28 spline 9 inch. i ordered a new one offline, same gear ratio but with posi. i reintalled it and also took the chance to reinstall new u joints in the driveshaft. i reinstalled the driveshaft into the trans a stuck it up to the diff, but the u bolts will not fit into the yoke on the diff. the yoke is slightly smaller width then the original. i emailed the company and they said if its smaller then its a 1310. i read somewhere that those came out of broncos. will my stock u joint work with that yoke and also where can i find the smaller u bolts for the yoke? i went to orielys but all they could give me was the original u bolt that doesnt work. please help.