These Bosch brand spark plugs are standard for almost all stock VW engines. They have recently been upgraded for longer lifespan. Threads are 14mm, and are of the “short reach” standard type. As an additional note, we recommend these copper core plugs over the Platinum plugs. We have found that on VWs with standard ignition, that the Platinum plugs tend to foul easily, especially on new engines, and engines with a lot of miles on the odometer. Stick with these reliable large electrode copper plugs! Set of four.