The Harley Davidson applications are developed using the same race proven street V4S street damper combined with a beautifully machined billet aluminum top-clamp, on some applications. Like all GPR Stabilizer products, these are all bolt-on. No drilling, welding, or cutting to your original equipment. Must use a 3"+ riser or T-bars on some applications. Frame mounts and Base Plate are machined aluminum and steel hardware all anodized black. The damper colors available are black, red, blue, gold and orange. Top-clamp available billet or black. please specify what color(s) you would like at time of checkout.