No reason for an oil leak here. For the price, they should be replaced every time the rocker cover is off. Sold singly, 2 required per engine.
We have now sold all the original seals we cleared out from Rover so July 2017 retooled to make a better product as all those available that we tested were poor quality imported seals. For the chrome washers and spacers see
SAC70--For chrome nut, spacers and washers see
SAC71L