The technical drawing that accompanies this on vxb website does not show the flange on the mounting side. The flange is approximately 2 inches diameter x .1 inch tall. It requires the mounting surface have a matching bore about 2 inches diameter. Otherwise you will have to machine the flange off. maybe you could use an angle grinder instead of a lathe. Vxb needs to correct the technical drawing. In general the tech. drawings are of very poor quality making shopping at vxb always an adventure in guessing what the product actually is.