[ChrisL]

[ QUOTE ]
...and I tried to see what would happen with a half inch shim under the rear "legs" of the seat

[/ QUOTE ]

Dan,
My seat fitment didn't require shims. Having had a closer look at your picture though, it seems as though your seat back is thicker than mine, which might explain why you are having these problems. Do you have any padding behind the backs of the seats? My seat has none (just the thickness of the leather) so it will sit as in my picture without shims.
I have cut the studs so that they don't protrude downward too far and hope to eventually replace the downward studs with upward bolts.

Also, its hard to see how tall you are from your pic (and that resemblance with Frankie is uncanny [img]/ubbthreads/images/graemlins/grin.gif[/img] ) but you will need all the head room that you can get if you intend on wearing a helmet. Shims may be an issue.

PS. Vibration and heat doesn't seem to be a problem.