Retainer Clip (For BMW Mercedes Audi Saab VW) Xenon HID H7 Bulb Base Holder Adaptor (Pack of 2) You are looking at a pair of bulb adapters. These adapters are needed to install an HID kit on certain cars; Certain bulbs are mounted on such a RING that holds them from behind; This allows you to install your HID bulb to your factory headlight Bulb Type: H7 Known Models that require this adapter are: For BMW E60 2003-2007 5 Series Vauxhall Astra H MK5 Vauxhall Vectra C Some Mercedes Models Some Audi Models VW Passat B5; B5.5 Included are 2 Clips as shown Pack of 2