So, I'll answer my own question ... Not sure if I did it right, but it appears to work. I drilled holes and popped the new clips in place. Then I got the felt channels in place an pounded them onto the clips with a wooden block. Seems to work. For the wiper seal, I lubed it up with silicone grease and squeezed it in place.

Pictures:

http://picasaweb.google.com/luscombe334/DumptruckDoorsAndVacAdvance

-Dan