Duplicate of OEM# 40392-91 compensating sprocket nut used on 1991-2006 Big Twins

Maintains Stock Appearance: Preserves the classic stock styling of your Sportster

New features include a more rugged built-in tool pouch

The Dyna S is completely housed behind the ignition cover and uses a magnetic rotor with the original advance unit

Battery Box 4L-BS w/ Breaker Mount for OEM Harley-Davidson Horseshoe Tanks Subcategory_Air Filter Elements Duplicate of OEM# 40392-91 compensatingThis is intended as an adapter for fitting a 4L BS battery to most standard battery compartments, including OEM Harley Davidson Horseshoe oil tanks, and it has a dual Bussmann Automotive Circuit Breaker mount integrated into the top strap. This size battery is mostly suited for kick start only bikes. 3D printed from Carbon Fiber reinforced Nylon. Made in the USA. Most any 4L BS battery should work, just check that it is 3 3 8 Tall, 4 1 2 Wide, and 2 3