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This is the lever assembly you want: eBay 235401329602 or one like it.
It is the most robust one out there.
Nartron makes a lot of the OEM electrical parts for the HumV, don't see any clones of them for sale.
I'd put a 10 amp fuse inline with the overall power feed to the directionals system.
Even with the 'real deal' parts, they are very prone to failure from even a bulb burning out and causing a very quick short.
Trailer wiring faults can cause a multitude of sins in the system as well.