You need 2pc for one engine.
Fits all 2V Boxer /5 models (R50/5, R60/5, R75/5).
S/S hex nut M10x1.5 SW 14 between cylinder and cylinderheads on the outside bolts.
Washer for S/S hex nut M10x1.5 SW 14 between cylinder and cylinderheads on the outside bolts.
You need 2pc for one engine.
You need 4pc for one engine.