Al-Fin drums were original "high Speed Equipment" accessories from very early TR2 production. I think they were developed originally for the SP Speed model TR2's, of which only three examples were made including the Jabbeke high speed run car. ,
The drums came in both 10" (p/n 301590) and 9" versions (p/n 202267).
A NOS pair, perhaps from a long defunct S-T dealer's spare parts stock, would be exceptionally rare items. I could easily see a well heeled TR enthusiast snapping them up.
After Easter I plan to ebay a pair of ultra rare DU6 dual 1.75" SU carbies, as fitted to the Sabrina engines in the TR3S Le Mans cars, and Coventry Climax GP engines. Only 90 odd of these were ever made, so it will be interesting to see how they go.
Viv.