When upgrading the headlight to an H4, in addition to the reflector, bulb and bulb connector, you also need to change the lens. If you have already upgraded the headlight of your /5 to an H4 and need a replacement lens, then this is the correct part. If you have the original Bilux type bulb, then instead you should order part number 6312650
Equivalent to 63 12 1 356 280