I have a 26" inseam and have been riding on 165mm (FSA gossamer cranks on a compact double BB30) through the hills, giving me nasty knee pain. I'm looking to go to shorter 155mm cranks, but having a very hard time finding reasonably priced options, and FSA doesn't make them that size. My solution is to have 175 mm cranks shortened for me.

Does anyone know where I can find FSA crank arms only used or new?

That way I can have just the crank arm shortened and not have to replace anything else or mess with the BB.