Dave, all the good 30100/30200/30202 etc and 37100's shared the same internal guts-does not matter if you buy one for a Chevy, Ford or Mopar. Only the shaft length is different. I see complete used ones for cheap on ebay...$20-25 or less.
There are differences between the 30100 and 37100 series so you need to buy what ever series you have but does not matter if it's a Ford, Chevy or Mopar. I think you are looking for the stabilizer plate assembly??
All the bearing and thrust washers are available at any good bearing co.I just bought a bunch of bearings and thrust washers for my Ford 30201. The originals were INA bearings and the part # is right on the bearings and the INA bearings/thrust washers, torrington bearings are still available from INA
Here is my Accel I had chrome plated. the used distributor in the center has the stabilizer plate I believe you are looking for?? The two boxes on the right are the rebuild kits for these distributors. Has all the springs, clips etc.