I got a new tent for my art shows and needed a different clamp for my lights. Silicon Lightworks shipped the clamp the same day it was ordered and the entire purchase process was a delight.
This piece is hard to find, ordering was very easy from this website
These clamps work well for attaching the lights to the top bar of my pipe and drape. My only complaint is that they do not fit in my hard shell case very well. With 4 lights it was hard to get the original large clamps in the case. These new clamps don't close down as compactly, making it virtually impossible to get the case zipped.