Jim designed these billet v/c half moons because he was tired of the rubber ones constantly seeping oil. We tested every version of the rubber half-moons we could get our hands on from the expensive factory ones all the way down to the chinese knock off versions, all of them had the same issue. This will be the last set you'll have to buy. A bead of ultra-gray on the rounded side that touches the cylinder head is the only sealant you'll need for the life of them.
We have them made for us here in Chico, California.
PRICE IS FOR A SET OF TWO.
Beware of the imitators that stole our design, get the originals.