This starter set-up is primarily for boats and pulling vehicles. It provides dependable starts and on-board control for one or two engines. Mounting struts are available for all popular engine blocks, blown or unblown. A steel engine jaw and aluminum spacer are included along with all nuts, bolts, studs, and washers. Some applications are available with built in crankshaft support as well, perfect for use on blown applications that put extra load on the end of the crankshaft. Those kits require 15.50” in front of the starter plate.