Electric PTO Blade Clutch For Riding Lawnmower. For sale is a new AFTERMARKET electric PTO blade clutch for riding lawnmowers. The clutch fits engines with a 1 diameter crankshaft. The mounting base has 3 holes that range between 4 1/2″ and 5″ on center. The drive pulley is 5 1/4 in diameter. Part number 1562 G1562.