Billet Internal Adapter for the LS 3.2, LS 2.2, Arrow, Hindsight, Hindsight LS and Blindsight Billet Bar End Mirrors. The 7/8" Adapter kit assembly will work on bars with internal diameters as small as 12mm (.475") and as large as 19mm (.750"). This range covers virtually all aluminum and steel bars/clip-ons.