Go the easy route and install a LeMans interior for the time being(if the car is drivable and you're just needing the interior to finish) and then focus on the Tempest fabric.
Or if the car is a long way from being done, continue to search Hemmings.com, here, and Craigslist for Tempest parts cars with decent interiors until you find enough to bring them to a shop so they can properly reproduce what you need.
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