This shackle is based on out stock dimension 2 1/2" shackel but has been lengthened 1" to accommodate the longer springs used in off road trucks. These shackles fit various Ford trucks using 2 1/2" wide leaf springs. This includes, but is not limited to, F150 2WD, 2 and 4 wheel drive Rangers and Bronco IIs, and 2 and 4 wheel drive Explorers. These measure 5 1/2" center to center. The shackles include our Delrin bushings and DOM inner sleeves. Sold in pairs.