I have rebuilt four or five of them for '37, I was making a mirror image set so both wipers parked in the center. It took several different motors to get the parts needed. With that said, I cut my own gaskets using the originals as patterns. It's not all that hard if you take your time and have a sharp knife. To get them apart, I used a brass tube pinched down to form an oval that fit over the screw heads. You can replace them with standard screws since they are a standard thread, just can't remember just what size they were. A couple of the ones I pulled apart had usable gaskets, I soaked them in oil to soften them. The motor worked just fine after a cleaning and oiling with all the original parts. A light polish on the inside helped with slow speed, as mine have twist valves to limit the vacuum for speed control.
White motor assembly grease works really good to soften the seals inside. If it's not totally dried out, some light oil will also help, just put some down the inlet and outlet tubes and work the motor back and forth easy. If you can find a small vacuum pump, working on you bench is a lot easier then monkeying around in the overhead of the truck.
Joe
