The BMW CE-04, the suit-and-tie spaceship, design far ahead of time. 

However it suffers from a fragile taillight assembly. design. The OEM taillight is rather fragile and replacement is costly.  These lights tend to just snap off upon gentle contact with a leg, knee, etc. Costly repairs can be avoided with a low cost solution.  These accessories provide a degree of additional protection.  

Two protector designs for the BMW CE-04 taillights. 

These protection designs serve as a bumper for the lights. An hybrid assembly of a 3d printed PETG-CF (10% Carbon fibre) body with  a stainless steel bolt that runs throught the centre., making it rigid enough to protect your lights.

Design #1		Design is to be used in combination with the OEM accessory shown in the image to the right. If you have this fitted on a NON-US style light.
Design #2		On a standard taillight assembly you would require this solution.  It  has a base flange, integrated mounting and protection in one part.   Suitable for NON-US taillights

Disclaimer: 

Still experimental, might not be street legal in some countries and NOT  for US-style lights.  They wont stop a big blow from harming your taillights in any case.