Beginning in November, 2003, all SuperLite® 17A/B and MK-21 Helmets will come equipped with a new style Alignment Sleeve.
The new part, Part #550-339, has a flange on its outer end which will help to insure that the Rear Hinge Tab Loop cannot become dislodged from its correct position over the Alignment Sleeve. The old style straight sleeve, Part # 550-039 is discontinued and no longer available.
This new part is retrofitable on all older SuperLite® 17A/B & MK-21 Helmets. See your local Authorized KMDSI Dealer for price and delivery information.