I bought an oil cooler, and fittings which i thought was 5/8, but i have just bought some 5/8fittings and hose etc from Burtonpower and its obvious these are bigger, so they dont fit,
the internal diameter of the fittings is 1inch, and the oil cooler is identical to a 19row mocal but with no markings other than "654" on. Burtonpower didnt know what fittings i have so couldnt help,

could only happen to me