They are available, but not many axle sizes, in fact I could only find one size, 113 I think?
There was a link in another thread in this section a couple days ago, Rampage put a link up for threadless BB and looking at that shop I found a 73.
I will try find it.
*EDIT*
it was your other thread
sjscycles.co.uk do one in 73mm, I need one, might have to order from them.
You could always re-cut the threads from english 1.370x24 to italian ones (they're a little bigger). Sheldon Brown has an article on how you could salvage a mangled BB thread by re-cutting it to italian. Then you could use any BB as long as you get italian threaded cups. Of course you would need a good bike shop that has the tools AND is willing to do the job! That's a rare thing nowadays.
Or listen to the previous advice and get 2mm taken off each side of the BB shell
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