None if I've been informed correctly. There's not a lot of clearance and I've been told only the T25 fits. It could be incorrect though. Maybe someone managed to fit a Hex bolt in there...but it should be tight! You should just use T25 and forget about it.
It's not the bolt size; it's the head profile you need to worry about. Check www.mcmaster.com to see if there's anything that'll work. You need an M4 bolt (right? Someone check me on that...) with a low-profile head.
If you are speaking of the rotor bolts they must be Button heads,m4x0.8.torx is your best bet as 4mm heads strip easily.
If you are speaking of the caliper mounting bolts then they are m6x1. Be sure to use LONG ones (like the ones now being supplied with Hayes) or you may strip out the casting! ditch the stock ones and get some that are about 5mm longer before it's too late(speaking from experience).
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