Hey John,
Those studs are supposed to be a bit longer. When bolted down to the fender, the nut sits about a quarter inch from the light housing. The nuts are usually rusted on and the stud breaks right about there. I've removed two sets and bought a third off Ebay. The two sets I removed all broke despite liberal amounts of Kroil penetrating oil. The set from ebay was broken also. I was able to weld a similar size stud to what was left on the housing and then grind and rethread. They came out pretty decent and usable.
Hope this helps! grin


Michael Zaic
Dahlonega, GA
52 GMC 150
48 GMC 300