Idler pullies Belt idler inside width idler outside width pistol spacer – RCD style 65 mm 2.6″ (2.56″) 2.65″ 3.01″ 75 mm 3″ (2.95″) 3.05 – 3.1″ 3.45 – 3.5 3.825 84 mm 3.3″ (3.31″) 3.4 3.83 4.135 Pulley width 3,5 or 4.5 ofset .375, .5, .