Jeff wrote: "The rotating part of the adjuster did not want to fit in the seat indent too well to do that but a little relief with a hole saw and shazam! In the middle and free as a bird. "
That seems to be the case with just about everything having to do with a CMC. I started building mine around 1995 (already had the body for two years by then) and when I went to assemble something, nothing fit - I mean nothing. Everything had to be futzed with, so yours is no different. My original seat glides were from a 914, came as part of a rigid sub-frame with the 914 seats I bought and worked pretty well. Even reclined slightly!