This item is number 21 on the Lister Petter drawing
measuring 2 1/4 inches inside diameter on one side and 2 inches inside diameter on the other end
This part only fits a 3 cylinder engine if your unit is a 1 or a 2 cylinder engine go back to the parts book and drawing and locate the correct part needed
there is a difference between the upper and lower cup
757-26381 Oil pressure switch
751-10432 Lister Petter crankshaft main seal, former part number 751-10430, used in the LPA and LPW2/3/4 model engines. AC1 This item is number 21751 10432 oil seal, Used on Lister Petter LPA, LPW S T G engines. This item is number 15 on the Lister Petter drawing. Former part number 751 10430. The LPA, LPWG LPW S T engines were used in numerous pieces of equipment, Moffett M5000 Forklift, Ditch Witch 400SX plow, Ditch Witch 410SX plow, Ditch Witch JT 920L directional drill, Ditch Witch JT 820L directional drill, Ditch Witch FP35 Fluid Pac, Onan gas generators model GNAA, GNAB, GNAC, Elliott