Old Bottom Bracket & Cranks Removal

Actually, gonna hijack the thread a bit, I'm just replacing the same kind of old bottom bracket with a shimano cartridge BB (UN-55). I assumed the square tapers would be the same thickness on both kinds, so just ordered the same width BB, though now I've got the cartridge in, the cranks sit too close to the frame and the inner chainring rubs against the chain stay. So I guess the Shimano tapers are narrower? PAIN IN THE ARSE.
Any idea how much wider BB I should order? The old one was 118mm, I'm thinking 127mm as it's making contact with the chains stays before I've even tightened it fully. Anyone else had this problem? advice?

Yeah you'll probably need a bigger bottom bracket (though 9mm bigger seems a lot) and also some of these: http://www.velosolo.co.uk/bbspacers.html
http://www.chainreactioncycles.com/Models.aspx?ModelID=36416&utm_source=Google&utm_medium=Shopping&utm_name=UnitedKingdom