I believe the engine this rocker arm setup came from was a 6HP Witte engine. Please measure up your engine and compare to these before purchasing. Part numbers KD243A and KD25A. The overall length of each rocker arm is just under 7 1/4. The rocker arms do move freely on the shaft. The rocker arm rollers do not spin, they are stuck!! Please see pictures for the absolute best description. I don’t see any cracks or repairs. The flip Oilers are broken.