Genuine Lucas Main Wiring Harness. For use on BSA models: B & M Group models (1946-55) including B31,B32,B33,B34 and M20,M21,M33. O.E.M: LU865493. Premium quality cloth braided wiring harness! Supplied with colour coded wiring loom installation plan. Main Harness: Yes Assembled in England. Lucas is a registered trademark of Lucas Industries Limited