for you 70s 40 guys with single pulley and need a double .its real simple take a 65 era pulley and add it to your 70 pulley.it will fit right over the top and has the same spacing as the factory pulley.first photo is a stock 72 water pump and pulley.second is with the 65 pulley placed over the top of it .third is the made up one and a factory double pulley both look about the same
