Machining off the front of the crank pulley is your best bet. Not overly expensive to get done either. My last one cost $20 to get done.
Either that or the Flexilite fans which Perm is using on his MX73 are quite thin, thinner than the DC ones i bought off him anyway. Check the Perms thread for that one.
From memory there were also some ultra thin fans from Supercheap which Rod used on his RA28... Check his thread for more details.
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