OCB, I have a 2017 MS. The gear that sheared a few teeth on my slide mechanism has 15 teeth an has a hexagon hole for the shaft. We're fixed up now and back on the road.
I contacted Lippert, the lady I spoke with new right away what gear I needed. Aired it out and got it in two days.
If you call Lippert they will know what your friend needs for his unit.
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