Don, why all th efuss as you do have a perfect sample (the doorcard)at your disposal?
Much easier to measure the pattern from a flat doorcard compared to the stretched cloth from an old seat.
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<font color="blue"><i>1976 TR7 FHC (needs some TLC ...)
1980 TR7 DHC (my first car, a.k.a. Kermette)
1981 TR7 FHC (Sprint engined a.k.a. 't Kreng
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