Assuming that you've tried fleabay then I suggest that you look for an upholsterer or re-trimmer close to you. Close to you because you might want to view anything before you buy if you're trying to match it to something 20 years old.
 
why??

plenty crappys scrappys out there. complete trim is dirt cheap..
 
sams trim..exmoor trim...

or..local material wholesalers,thyough you may have to dye that to colour you require..
 

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