Specification :

This product will enable you to install an HID kit in your E46 without modifying the stock adaptor. The BMW E46 has an adaptor that locks the stock H7 bulb into place. This product will take the place of this adaptor as it has been designed to both accomodate an HID bulb and lock it into your vehicle's stock headlight housing.

Other adaptors we can offer is: BMW E39#1; BMW E39#2; BMW E46; AUDI; GOLF V; HONDA.
Bulb adaptor is for some car, like BMW; AUDI; BENS; ADDESYE, these cars have special lamp base that make normal mounting on bulbs difficult. So use this adaptor to help the bulb mounting on these special car types. It is ery easy and quickly installation.
For more details, please kindly let us know!