not for sale anymore see 

41mm fork leg here https://www.twinmotorcycles.nl/webshop/artikel.asp?mc=1&aid=793&cid=0&s=steering&a=

43mm fork leg here https://www.twinmotorcycles.nl/webshop/artikel.asp?mc=1&aid=794&cid=0&s=steering&a=

Buell XB Lightning,  GPR V4 Steering Stabilizer, black

Finally the Steering stabilizer for your Buell XB Ligtning all model years. The GPRV4, specifically made for sport / road racing bikes. We've taken our proven fluid control technology and squeezed, trimmed, and lightened this model up to be exactly what the racers want. Smaller, lighter, faster. A large dial with a definite 'no-slip' grip that locks into place with a positive 'click' at 20 settings. color Black