Be warned, the 10 lbs. polished Nytrex bottle I got was fatter than the standard 7" bottles. Not a single billet bracket kit would fit it. I don't know if this is all their bottles are just the polished one I got.

I thought it was the brackets at first but after the summit brand didn't work - I took the bottle to a nitrous dealer and low and behold - it wouldn't fit in any bracket.

I think it may be mm sizing but I'm not sure. PIA - I ended up having to make a custom bracket for the bottle...[:@]