Can stainless steel be welded to fenders and quarter panels?

Good question regarding body fillers. In this case, however, the stainless steel bracket/fixture/whatchamacallit I am fabricating will be attached to the inside of the fender/quarterpanel to provide the proper recess for the 1971 style side markers. I will simply enlarge the hole in the body panels enough for larger red/yellow lens to squeeze through from the inside. The bracket doesn't even have to be welded because there won't be much stress on it while it's just holding on to the side marker. Any one of several imaginative ways to keep it there would be sure to be satisfactory, I'll keep thinking.