Up for sale is a fully functional, good used BMW Mustard relay.  These units if defective can cause loss of headlight or tail light function.  This unit is USED, and WORKS, however I would still suggest re-flowing the sadder joints in order to get the most life out of this relay!  Cracked joints are a VERY VERY common problem with these, which will cause loss of or intermittent headlight or tail light operation. 

 These are very expensive to buy new, and are excellent to have for diagnostic purposes, or if you have faults you are trying to correct. Thanks for looking!