if all else fails, go to the local hardware store and buy a couple different size nuts and try them to see which one fits. Try fine and course threads.
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96 GT Vert., was auto now 5 spd, BBK CAI, Summit U/D pullies, Flowmaster 40's catback, BBK catless H pipe, SCT Xcal.2, UPR billet interior, CDC lightbar, Steeda Tri-ax, Spec clutch kit, 95 cobra R's 17x9 w/ 245 front & 275 rears, Eibach Pro's, FRPP 4.10