You need 4pc for one engine.
For pushrod tubes diameter 18mm.
Fits all 2V Boxer /6, /7 and 248 models from 09/1975.
R60/6, R75/6, R90/6, R90S, R60/7, R75/7, R80/7, R100/7, R100S, R100RS, R100RT, R100CS, R80G/S, R80ST, R80RT, R80GS, R100GS, R100PD, R100R, R80Basic
You need 4pc for one engine.