l322 key fob

hi guys, does any one know the part number for a replacement key fob for a 2003 rr l322, i only have one and it is a bit hit and miss, didnt want to go to the stealers with this one, seen a few folding keys on ebay will they work ? as my key is a standard key with 3 buttons.

thanks in advance.

If it is like the P38, you can only get a new Fob from a dealer, they come from Germany and have to be programmed to the car.