Billet oil filter housing for engines with 12A prefix. The original is no longer available but this is an upgraded version to stop flexing and cracking especially sort after by racers. Should be used with braided hose pipe to replace the metal original with seals originally fitted that leak under arduous conditions. These do not have the mischievous pressure release valve ball that ensured flow to crank bearings if the filter became clogged. As it operated at 7psi it was not much use in mini engines that idles at 20psi and above which allowed unfiltered oil to trickle back in which is why many engine tuners blanked it off knowing that everybody now changes oil and filters regularly as the car is so valuable.