Pair of .040 oversized pistons for Harley-Davidson 45 inch flat head. Got a large box of these from a dealer buyout and because there was limited information on the box we couldn't do any research on the Internet or an old catalog. We did have a .030 oversized piston running elsewhere on eBay and we compared it against this piston and it was almost identical except this piston was just slightly larger so we assume it's for a Harley-Davidson 45 inch Flathead that needs a 040 over size piston. We don't know what years this fits. If you purchase one listing you will get two Pistons which is enough to do one engine. Please note it comes with the circlips and the wrist pin but no piston rings. You will have to get them elsewhere. Also note that the boxes are getting a little rough and they are dirty. The Pistons themselves could use a slight cleaning up also from oxidation because they've been
 sitting for so long.