The shaft to flange angle on my replacements were slightly, very slightly, angled, and this prevented seating of the clips using the original spacers. I ground a slight bevel to the clips until they popped into the groove. Took a couple tries. I think this is a problem with aftermarket axles that are shaped slightly differently. Otherwise all went well.

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1983 CD
1958 Studebaker Packard (being resuscitated)