Frode why do you need to remove the rear flange of the crank shaft ? its all one piece the bushing sits in a machined portion of the crank there is no reason I can think of to remove the flange where the flywheel sits.
I have used roller pilot bearings before but I prefer the oil inpregnated bronze bushing myself. Do a dry test run of the input shaft with the bearing on the bench or floor if possible or at least try it on the input shaft of the trans first.
Ron
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