I got one turned from Delrin (a black engineering plastic) from one of the American suppliers some years ago. I remember someone here supplying something similar or in aluminium (might rattle against the stick but nice and silver) but cannot remember who it was. Suggest you try a query on the FB Triumph TR7 Owners Page as it tends to get more coverage these days.
Alan Saab 9-5 2.3t Vector Auto Estate Stage 1 Saab 9-3 2.0 SE Turbo Convertible '81 TR7 DHC
Hi Richard, I am not sure if these are still available but if you go on the TRDriversclub website the ferrules are still listed for sale at £15.00 plus £2.50 p+p in ali or plastic same price for either. You could try on the contact here :-info@trdrivers.com Cheers Moe
You could try Spitfire part #ZKC301, but not sure on the quality of this ... Currently working on this part for my '76 car, first (3D) test print ready