Have a close look at that plastic clip.
It may have the part number on it. Look on the back of it.

It holds connector C158 fuel rack position sensor and C155 engine speed sensor. It looks very similar to a clip used for the ABS sensors on early 126 and 124's. Part number 126 545 08 40.

The metal clip might be a 617 159 13 40, however I have not seen a good photo or drawing to confirm.