There are not two roll bar designs, and that's a pretty major part to change for seats. While Porsche designs are pretty great in general, they aren't always perfect (see: original clip on cupholders and replacement dash mount cupholders). My guess, and it's a guess, is that the sport seats may have had an extra stop on the seat rail.
Not sure if it's relevant, but my normal leather seats are 100% touching the roll bar when back as far as possible.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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