I've been using a single set of Wall Street II bushings, 0.474", with a rather wide range of Sierra-style kits, with a perfect fit for all of them. This includes the WS II, Elegant WS II, Sierra, Elegant Sierra, Tapa Pacifica, Zodiac and Diamond Knurl.
There is one kit that looks a lot like a Sierra, but is not...called Aero (I think its a Dayacom kit) that uses a smaller tube, but has almost the same size finished blank. This is one of the few Sierra-like kits that I've found that aren't compatible with the 0.474/Bushing 20A.