I recently got a PP455 with a bad Piston and Cylinder. I have found a Cylinder that says its part number 5074766801 . The online vender has it listed to fit a pp405 or a pp455 witch can't be possible. since they are different bore diameters. I have asked the vender to measure the bore diameter but don't know if they have the ability or proper knowledge to measure accurately, I have bad visions of them trying to measure with a yard stick. Does anyone have any information on that part number ? I'm trying to do my homework before I get the wrong cylinder. Or does anyone have a good cylinder for a P45/PP455 .