Some 84 and older models still sport the small capacity square plastic filter. VW determined that the flow was restrictive and upgraded to the larger capacity metal fuel filter for later years. This kit includes an aluminum one-piece adapter (the filter also served the purpose of stepping up the fuel line from 7mm to 12mm), the larger fuel filter, all necessary clamps, fuel line (We use 7.9mm fuel line in place of the 7mm line), and two zip ties to tether the new filter.