The problem is Allan, that although one kit may have the same nominal tube sizes and finished dimensions as another kit, that manufacturer may make their tubes with a thinner of thicker wall than the other kit. A Turner's Retreat Baron for instance shares similar dimensions with a cheap and cheerful Jr Gent. The drill sizes for the tubes are the same and so are the finished sizes, but I wouldn't like so say that the inside diameters of the tubes of both kits are the same, and therefore you are better off buying bushings for the each kit from its respective manufacturer, rather than trying to save two or three quid by compromising.
Sometimes, a manufacturer has similar kits themselves, where the same bushings WILL do the job. Back to TR's Baron as an example, they do a Sedona which is based on the same platform, with the same tubes, so one set will cover both. But generally speaking, mixing bushings between manufacturers is a recipe for error in my experience.
Just as a side note - call them what you like. Bushes, bushings. Who cares. He's right really, but I make a point of calling them bushings in this forum specifically because it is guaranteed to get a reaction from Brian. Works every time. Sometimes it ups the stakes if you point it out too. I don't do bungy jumping, but this is quite good sport if you want an adrenaline rush. Oops - Sorry Brian - you know love you really 
Respect init
Edit: Ooh - lots of posts crossed in the meantime, all essentially saying the same thing. We all agree at least. The adrenaline rush was good though.
