Mine came in the mail today, installed them tonight, had to trim them to fit around the lowers (sharpie and die grinder), 3 times on and off to get them to miss the lowers when at full lock. The spacers are to thick for the turn signal/ driving light bracket to sit flush, but now they are spaced out a little more. I think they would fit a bike without lowers without having to trim them at all. 8" of snow on ground, so no test ride for a while!
Very small amount that needs to be removed. Like an 1/8" of an inch over a 1-1/2" span. But you have to figure out precisely where to take it off. This would be an easy fix by the manufacturer. I have not ridden my bike yet to see how well they work.
Patience is key, trail fit, use a magic marker to trace the relief needed, trim to the line, check fit to verify, if good then install, if you need a little more off, mark it again and trim some more off. I used a die grinder and 1" rotary file followed by a 1" drum sander for clean-up, at full lock there is a 1/16" gap between the lowers and the GADS.
Manufacturing tolerances is probably the issue. It wasn't much of a trim, but I wanted to match the lowers profile when I trimmed it instead of a straight or guessed cut, must be my aircraft manufacturing experience kicking in.