[wingnut60]

Well, I got the project almost finished. Built the wood support up from 1x2 stock and lathe wood. Came out with almost the exact diimensions that were there originally.
Got the plastic screwed onto the wood (original was power-bradded with maybe 1000 brads--the guy was on a roll that day) and then drilled the screw holes in the teflon blocks. Put it all together and then fitted it under the slide. Tested the slide in/out--it works as it should. Now, all I need is to finish attaching the plastic to the frame and the gasket to the frame.
Thanks for all who sent me ideas--the hardest part was figuring out how to raise the entire slide up high enough to work under it.

Joe