Well I found this diagram on Pelican's PET catalog
http://www.pelicanparts.com/cgi-bin/...4&Line_Item=16. Its a 968 seat but its identical to the 964. It does look like I could remove the electric motors (12 and 12b) along with the motor cables to the 4 "jacks". This would trim some weight but I don't think it'll help with height. The main seat and rail connection is the big bolt (25) on both sides that form the pivot. This is a fixed height. The lowest I could get my butt would be to have the two rear "jacks" at their lowest points which they are. Interestingly enough, I found no purely manual seats in the catalogs from this era except for the Club Sport and RS shells. I know the RS America didn't come with them as there were only four options available for that car and seats wasn't one of them. I'm sure there could have been something out of the Special Wishes Program which is why I never say never when it comes to P-cars.
DR: I've been to the link listed in your sig line and its very helpful. Thanks.
Anyway I think I have a solution involving an aluminum shim to fit between the seat rail and the body and a short piece of 1/8" steel drilled for a M6 bolt to act as a washer between the bolt head and the seat rail. This is all way more than I wanted to know about Porsche seats! Thanks everyone for the input and advice and I'll let you know how it turns out.