Here are the dimensions for my Sparco Pro2000 Plus (in red). Dimensions are in mm so just convert to inches. This seat fit fine in my 1999 stock Boxster.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Thanks for the info. Been Down at Porsche Parade in Monterey. Very cool location but I live in Northern Calif. so only a short trip for me. Met a few folks that have also made aftermarket seat swaps. Seems it is only problematic if you are trying to tie in any power options to your current seat set. If not then its prety straight forward.