BSA Pre-Unit Singles Twins Chrome Oil Tank Filter 42-8426 42-8334 A7 A10 B31 B33 BSA Pistons TR6R & the Thunderbolt) from

TR6R & the Thunderbolt) from 1971-1972 only

Fits all 750 & 850 Norton Commando Twins (Fastback

*****Please note that this Seat Cover may also fit other Pre-Unit Twins that are not listed abouve

Measures 3/8" with a thread pitch of 26 (CEI)

* This is the best you can buy

BSA Pre-Unit Singles Twins Chrome Oil Tank Filter 42-8426 42-8334 A7 A10 B31 B33 BSA Pistons TR6R & the Thunderbolt) fromNew English Made BSA Singles & Twins Chrome Oil Tank. This oil tank filter comes with a marvelous English chrome finish just like O. E. M. The best. Screen measures a slightly over 1 3 4". Fits many BSA Pre Unit Singles, and Twins from the A7, A10, B31, B33, B34, Goldstar, RGS, Road Rocket, Etc from approx 1954 1963. Please refer to your parts catalog for proper fitment. *****Please note that this filter may fit other BSA models that are not listed