The problem I have encountered with the spin on adaptors is that they come with a one of a kind mounting gasket. After a few years the gasket dries out and you have a leak. I have not been able to find a replacement. I have one of the adaptors I will donate to someone that can find a gasket for it.
I have however been able to purchase the original canister type filters from Napa, Truck Shop, swap meets and others.
Fred
