Call Moser and ask about having your axels bearing surface turned down to fit the sealed ball bearing. With this the retainer will ony have to hold the axels in and no seal is required.

If you add disc brakes depending on how they are mounted, you may need to make a 1/8 spacer to make up for the backing plate.

If you are using drums all should be ok. Just be sure to check the depth of spline engagement on the 31 spline axels. Make sure they don't contact the spider pin.