Compatibility: Replacement for all 8hp-16hp engines with 1" straight crankshaft with 1/4" keyway Replacement for Predator 420cc Replacement for GX 340/390 Replacement for 209133A, 209133, 209139A, 209139, 209151A, 209151 Replacement for Manco: 2432 Replacement for Briggs and Straton Replacement for Vanguard V-Twins Replace Part Number: 203015, 203015A Belt Replace Part Number: 203785 Dimensions: Vertical holes: 3 1/2" Diagonally: 5" Package List: 40 series driver for 1" crankshaft 40 3/4" series driven pulley 40 series 7/8" wide drive belt 10T sprocket for 40/41/420 chain jackshaft assembly heavy duty back plate with all mounting hardware outer cover with mounting hardware (Jackshaft and all mounting hardware attached to an easy to mount backing plate) Note: If used on engines larger than 16HP, you will burn up belts. Please carefully compare the product with your original item, make sure the model fit your need.