I'm replacing both derailleurs on my 80s Trek 400, and I don't know what to replace them with. It has Suntour ARX derailleurs. I was going to replace them with Suntour 4050s, but I need a cage lenght of 29 teeth. The 4050s only go to 28 teeth. Most of the ARXs I've found are scratched. Does anyone know where I can get some NOS or in the box ARXs. The main reason I haven't just gotten a mountain bike long cage is because I like the clean, shiny look of something like the ARXs. Any suggestion? Thanks.