Dillon, please get your terminology right. Crank arms are attached to your CRANKSHAFT and also the piston. I could be wrong but last time i checked there is only one piston in the a35, one crank arm and one crankshaft. There are plenty of pictures and diagrams on themopedjunkyard.com if you are unsure.
Here are the parts you need. Buy them once, get the correct size. Instead of waiting for someone from NJ to take 2 months to send you some regular washers.