If your interested to keep the Sport Seats (although heavy) you can check out Leatherique.com
I have done that to one of my sport seats. The Leather turned out pretty good. I wish their color matching (Cashmere interior) was better. Oh-well I imagine, the colors will match better after a year or two of sweating on the refinished seat...
Have fun!
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Nick Hromyak
'85 Carrera 7 & 9 Fuchs
Havin' Fun in Sacramento