I, too, am sort of looking for the armrest pads. I used to have a picture of the JPM product but have since lost it. My plan, is to go to the local Street Rod Upholstery guy in a nearby city and have him make me up a set. He has made a similiar product for me in the past. Arm rest pad on the console of an MGB. I believe the original door pads were held on the door with sticky back Velcro. For the size of the pad, I would think I could have them made up cheaper than what JPM was selling them for a few years ago.
In a pinch, you can buy a couple of Gel mouse pads, Trim off the excess , and just use the padded part.. works great.. Because they are made not to slip.. mine have a rubber backing so they don't slide around.