It would be item number 8 in the Hercules drawing
Total of 4 bolts and 4 nylock nuts used for the 2 center clamps
751-10620 oil filter
657-34281 Overhaul gasket set for models LPW/S/G
This would be item number 5 on the Lister Petter drawing
750-41610/050 Piston assembly, used on the LPW and the LPWS Lister Petter series engines. D4800 It would be item number750 41610 050 Piston assembly, used on the LPW Lister Petter engines. This assembly includes the piston, rings, wrist pin and the cir clips, items 1, 2, 3, and 4. Please study the parts page provided here to ensure proper part. This piston is . 050mm oversize (20 thousands). This will be item number 1, 2, 3, and 4 in the Lister Petter drawing. DO NOT USE THIS PISTON FOR AN LPWS ENGINE, LOOK UP PART NUMBER 750 40094