With 7/8 and 3 mounting holes. FROM MAIN CENTER SHAFT TO EACH MOUNT BOLT IS 4 - CENTER TO CENTER.SPACING BETWEEN MOUNTING BOLTS IS: 7 11/16" - 6 3/16" - 6 7/16. FITS MANY BRANDS SUCH AS KARCHER, GENERAC, BLACKMAX, CRAFTSMAN, BRIGGS, HONDA, POWERSTROKE, and OTHERS! Thank you and any questions please ask! We appreciate you taking the time to look at our product and will be honored to offer our services to you. The item "New 2700 PSI PRESSURE WASHER WATER PUMP fits Fits Many Makes & Models" is in sale since Wednesday, December 17, 2014. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Pressure Washers". The seller is "usapartsource" and is located in Attica, Michigan. This item can be shipped worldwide.