Iíve seen that clip fall off on a random number of trailers and all brands of axles.
That P/N is a 10Ē brake assembly. Are replacing both on one side? I would do all 4 so they have the same wear on them. If the drums are good, no grooving you can re use them.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.