vw sell the bare plugs, the pins on their own and pins with a length of wire crimped on. if you want the most common type of pin/plug, you can get them from vehicle wiring products. they're 'junior timer' type connectors, just make a note of how many locking tabs each plug has. I bought a load of 2 pin plugs to make MK2 relayed lighting looms, then found the vag spotlight plugs have 2 lock tabs, and the plugs I bought all had 1!