Does anyone know of a good source for these nuts with yellow nylon inserts
I have taken the regular, commonly available, white lined nylon lock nuts and dyed them with Rit clothing dye. It is best to run some sample batches because if you overcook them they will get brownish instead of yellow. Also, I think they have two yellow colors and the brighter yellow is the one you need and it may be harder to find.
NEWCO Products in Los Angeles (Chatsworth?) has these. Imported from Italy - so not cheap. If youy are going to have your car FCA judged, or simply want it to be correct, yellow insert ny-locks are a must.