Good used parts have a very low inventory and usually aren't listed online.I have looked at all the websites and basically have come up empty . Thanks for the suggestions .
My car is a Fordomatic ; I didn't realize there was a difference in pinion yokes Thanks for responding .
Mac seems to be thinking of the front yoke, not the rear - mentioned slip yoke
Thank so much for advise and assistance regarding my search for a pinion yolk . Concours Parts has them . They refer to them as rear u-joint flanges ; great company to work with .