I would have to believe it would fit a Sgt Fang. I have one in my MSH1 which is a little bigger. You might have to trim though, not sure.
They are smoked acrylic accurate for ROTJ, not dark green accurate for ESB. However my bucket is ESB, I am using it until I find something more accurate that is still nice and dark.
Sorry, don't have a spare. Try going through BM direct, I had mine in a few weeks.