B3B / '52 wiper mounts

[pflaming]

I have one set of mounts from my truck, and two sets for cars. Those are complete sets motors, arms and mounts BUT none have the small nuts and washers needed to attack the arms. On Later vehicles the wiper arms were held on by a stud bolt. Question: where do I find those nuts and washers? I will trade a car wiper motor for a set of those nuts and washers. Fortunately I live where it seldom rains, but my future driving range Will soon include mountain fishing and it can rain up there.