Husqvarna 40mm Fork Seal SET 250 400 430 500 510 (81-85) BSA Electrical Threads are 12mm diameter x

Threads are 12mm diameter x 1mm pitch

for that custom or racing look you may be looking for

Length of the rod is about 24 inches

If your tachometer drive housing is cast integral with the gear cover

Husqvarna 40mm Fork Seal SET 250 400 430 500 510 (81-85) BSA Electrical Threads are 12mm diameter xThese seals should fit just about ALL Husqvarna 40mm forks from 1981 through a bit past 1985. Dimensions are 40mm x 52mm x 7mm. Two double lipped seals per leg, just as God and the Swedes intended. This listing includes all four seals shown. These are Brand New, current technology neoprene seals, excellent quality guaranteed. You will never find a cheaper delivered price for these wonderful, tested fork seals.