Axle change?

I believe the housing is different between the '64 axle nut and the '65 flange type axle shafts. "64 used shims to adjust the end play, whereas '65 and up used the adjuster type retainers. Maybe Moser or someone else makes an axle shaft that will bolt in and work? A simple call to them will answer that question. Maybe with green bearings? Otherwise, you'd need to cut off the ends of the housing and weld on the later ends.