I am quite sure that the GPS/GSM are sharing the same antenna even thought MB doesn't offer Teleaid or Netvigation in our area. And I think for a clean look, the dealer might as well not installing the antenna due to the unavailibility of these functions. Does it mean that I only require to order the antenna mask only can take advantage of the pre-wire harness. In fact, this is all I want to do.

Could you tell me any shop/dealer online I can order these parts? Thanks.