Does anyone know the outer diameter (approximately) of each size eartip (as in the diameter of the foam part when it is expanded - not the tube)? I've ended up preferring the largest size tips that were included with pretty much every set of earphones I've bought, so I hate to buy a 3-pack when only 1 of them will really be what I want to use. I'd rather buy all one size, but I can't tell from a few reviews whether these might be particularly oversized - the one exception in my preferences was that the blue foam that came on the T2's I have were a bit too large. I went for the largest silicone tip instead. Thanks in advance.