bolt for frame

hi i have a 1997 trek zx7000 and it has a built in hanger and i have a xt rear derailleur but i have lost the bolt that goes through the (12mm) hole in the frame and then you screw the derailleur to that could some one please help as i cant find anything anywhere
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the frame should have a 10X1mm hole for the mech to screw onto.
the mech should have a mounting bolt that is part of it that will screw into the frame. there are no 12mm fittings.
maybe you are looking for a breakaway bolt? still not 12mm though.
Parktools :?:SheldonBrown
the seems to indicate no replaceable hanger.
Parktools :?:SheldonBrown