The front Alpina spoiler is only a bottom part that screws onto a 628 CSi bumper.

There were no front foglights until 1982. However the Alpina spoiler can only be attached to a 628 CSi bumper. To do it with the 635 CSi model you have to buy a proper bumper first.

This ia a late E28 based 6-Series car. Front foglights cutted into a front spoiler. Note this is a 628 CSi front spoiler also. Not a 635 CSi one.

The later style Alpina spoiler (type #658) without the brake duct openings, for 1988-89 sixers with the universal bumper, simply exchanges with the regular 635 CSi spoiler.