Guys - I have ordered an e46 16 space saver which I am told will be fine as a spare. You can get one for about £50 from eBay.
I think for the 330 above, you need to get a 17 to clear the bigger brakes...
In terms of the switch to runflats - BEST THING I EVER DID!! Seriously, the ride is so much smoother (I went for Michelin PS2s). Infact, i am also going to do the same with my 1 series!
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