This listing is for a kit that consists of1 set of black 3d printed tracks from flexible tpu. 4 small rollers printed from abs resin and 4 large wheels printed from black petg , They may fit other models. Will combine shipping . Check out our ebay store APEJAYCUSTOMS for other items . Don't see what your looking for just ask we may be able to print it for you. BULLDOZER NOT INCLUDED, Veteran owned and operated. Thankyou for looking