This is a brand new replica Lucas E3L dynamo armature 60 watt. Total length is 7 1/2 inches or 190 mm.

Part number: 200752

Fits: Ariel: 650cc Model FH Huntmaster 1954-59. BSA: 250cc Models C10 and C11 1949-53. 500cc A7 all models 1950-62. 650cc Models A10 Golden Flash 1950-62. 650cc Models A10 Road Rocket 1955-62. 650cc Models A10 Super Rocket 1959-62. 650cc Model A10 Rocket Gold Star 1962.