FYI: I was fortunate to purchase and receive a Tumbleweed Mini Pannier Rack recently. Included
with the rack was a very nice set of mounting hardware which included very nice black alloy spacers (Six total - 4 x 2.5mm thick and 2 x 5mm thick). I mounted my rack on the rear of my bike, but I can see where one may choose to use the spacers to mount it on the front, reducing the *squeeze* on the rack legs / dropout interface.
Daniel really thought things out and I am very impressed with the quality / features of the rack along with the included hardware. One last detail: from the pictures on his website, one could see that the Mini Pannier Rack does have a lighting tang. I couldn't tell if the tang has a single hole or two holes for a two-bolt Busch & Muller rear LED tail light (such as the Toplight Line). I can confirm yes, it indeed does and it is properly spaced for a perfect fit [when will NItto include this feature on their racks?].
Best regards,
Jeff
Claremont, CA