Sooty

Hi everyone.
I am a new Mercedes owner.

I am looking to change the Halogen stock bulbs to an after market HID kit.
I have bought the correct kit and and completely compatible.

The only issue I have is getting the H7 bulbs to hold in place.
I know most MB have the metal clip to hold the bulb in place.
I have some metal clips that are designed to hold an after merket H7 HID bulb in place (they look the same as the original ones with the extra hole for the cables).
I cant get this clip to stay in place, I can get it to push in the holder and twist but wont lock in to place... Any hints or tips?


Thanks in advance