Rick,
It's been a couple of years since your post. Did you ever find what you are looking for?
I have a Norms doorway dolly, with side boards, push bar, 4 pieces of 45 degree curved track, 3 pieces of 6 foot straight track and 3 pieces of 8 foot straight track, rubber tires, roller skate wheels, and the large red wheels that are concave. Hardly used. In fact, the 3 pieces of the 8 foot track are still in their original shipping cartons.
Thought I'd throw that out at ya.
Thanks,
Tom