I'm in the same boat. I think my front is salvageable, but rear needs to be replaced. Pulled them from my shaft to see if I could find any identifying marks, but none other than Spicer USA. The parts manual calls out two different part numbers, but the ones I pulled seem to share the same characteristics/dimensions. Curious if anyone else has sourced the spicer P/N. I may head up to my local parts store to see if they can assist.