Command Clutch HubTractor Pullers using Command motors 18 25 this is the part you need to bolt to stock or aftermarket flywheel Stock flywheel uses metric bolts(52731), aftermarket uses standard(52732) ( 5 16 24x2 ). Bolts sold separately in sets of 4. Approx 3 3 4" Round with a 4 bolts on 3" center to center. Will work with Briggs with the raised center of 1. 875 Holes are drilled 5 16" but can be drill out to 3 8" if needed.