I'm looking for a few remaining details on my 1986 Vanden Plas. In particular, the two rubber stops that are attached to the rear door catch. I've highlighted the part in question below. It's such a minor part, but I had to ask if anyone had one or two available!!
David at EverydayXJ had two available, so I bought those. I think you are right however, that a nicely cut rubber piece would get the job done quite well. That was my next option!