This series of engine is no longer available. It had a 1" x 3" shaft.
Additional Info
The wider OHV engine should work in there. You would have to purchase the sleeve to take care of the shaft difference. Please note...If your key stock is built into your pulley, this sleeve will not work for you. If your pulley will fit on a shorter shaft you could possibly use the engines with a 3/4" diameter shaft with the sleeve.