This 4lb stainless steel radiator pressure cap is suitable for Land Rover Series 1 (One) and Rover P4 models from 1950 to 1961 fitted with the larger radiator filler neck. Please note: This is the larger type pressure cap, measuring approximately 70mm in diameter. The radiator filler neck must measure 68mm in diameter. The cap is supplied in a natural stainless steel finish and does not come polished. As it is stainless steel, it can be polished by the customer if a brighter finish is desired. For size confirmation, please see photo 3 for reference. If you are unsure about fitment, message us with your measurements and we will advise. Message us anytime if you need help confirming sizing or require alte.