Have you checked to be sure the bolt pattern is correct, once the bearing retainer problem is solved? Just don't concentrate on one part of the fit problem, and then discover there are other concerns to deal with. How about overall length, driveshaft yoke spline, rear mount, if applicable, etc.? All these things can be dealt with, but it gets frustrating, trying to make something fit that was not designed to bolt together.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!