Originally Posted by
jimc101
A 4D-LITE Plus (B&M don't list a model called 4D toplight senso as a current model) is a fender mounted light. All Toplight models are rack mounted, so think there is some confusion over model names here, the only model with 4D in the name is a fender mounted light
Huh?
Do a google search for "busch muller 4d toplight" and look at most of the results. There is Definitely a B&M 4D Toplight Permanent Taillight, and is definitely designed for rack mounting.
e.g.
Busch and Mueller 4D Toplight Permanent Tail Light at BikeTiresDirect
Busch & Müller 4DToplight Permanent Bike Tail Light | Bike Bag
Discount Busch & Muller 4D Toplight Taillights, TheTouringStore.com