This has a 1" x 3-5/32" Shaft, Electric Start, 9 Amp Alternator, and Fuel Pump. If you purchase an engine without at least a 9 Amp Alternator, you will need to reuse your stator and regulator from you original engine. If you purchase an engine without a Fuel Pump, you will need to reuse the dipstick tube, vacuum & fuel lines, and fuel pump from your original engine. You may have to reuse your exhaust system. It will fit any of the engines listed below.