Think you'll need backing plates and all new hardware for that switch. Two bottom holes on spindles may need to be drilled slightly larger and bigger bolts in them, don't know why they did that. MC should be same/OK. Lots of fellas pull the orig axles out, front and rear for changeover to modern, should be able to find 51-up parts cheap that way. The shoes, springs, and cyls are all needed new and available probly anyway. Not sure if you also need the newer drums and hubs or what?
