Lost my gas cap and I'm wondering which to order from ECS tuning.
http://www.ecstuning.com/stage/edpd/...egory=Exterior
I have a 2000 A6 2.7T. Do I need a ES#2249 (For cars with central locks) or ES#2717? Thanks. I would look at the car but its in the shop... is there any way to tell? what should i look at when i get it back?

 

one is a genuine OEM part and the other isn't but they are both the same apart from the obvious$$$$$$

quick edit: other reasons are did it have a locking cap? central locking locks the gas flap so the cheaper one is good enough, older cars didn't have such luxury's but either way if the thief wants your fuel no gas cap will stop them locking or not