They are both second gen; the broken one has the spring bolt come in from the top side of the derailleur, and the crappy one is one of the last that they made with steel pivot bolts, etc. But the face plate (parallogram arm?) looks to be exactly the same in either case. I'm not Art Stump, but I live down the street from Art the second, guy has a state of the art machine shop in his basement. Should I ask him to do it?