These cast alloy oil filler cap covers are made here in Australia and are made to fit over the factory oil cap. They are designed to be pushed over the plastic cover and with a small amount of adhesive to stick them to the plastic cap. You are buying 1 only raw satin finish oil cap cover.
The under side is the same shape as the serrations on the factory cap
A drop or 2 of adhesive will secure the cover in place.