Stroke is the same on the 181, 281, and 288 at 38mm, bore is the same between the 181, 281 at 52mm, the 288 is 54mm. I'm quite sure a meteor piston can be had in either 52mm or 54mm, same with cylinders. The 288 kit will work on any of them, but again, the OEM 181 cylinder has a smaller...