My son has a 96 bronco with auto hubs and they do not work, he got stuck in the mud, I want to put manuels lock out on it. I called 4wheel drive parts and they said they have the warn but I also need somthing called a spindle nut conversion kit, the oriellys that I called had the lock outs but never heard of the conv. kit do I really need the conv. kit or are they just trying to get more money out of me. thanks you can message me thanks again.