THIS WILL FIT MOST OF YOUR OLDER ONAN AND KOHLER AND SOME WISCONSIN FUEL PUMPS WITH A DIAPHGRAM SHAPED LIKE THIS ONE YOU CAN SAVE SOME MONEY AND YOUR OLDER TRACTOR RESTORATIONS WILL LOOK MORE ORIGINAL SCREW HOLES ARE ABOUT 1.300 CENTER TO CENTER.NO CHECK VALVES IN THIS KIT  (NOTE FITS ONLY METAL FUEL PUMPS ONLY)