DC2 ITR owners, what size bolt??

[BIG`O]

just bought an ITR strut tower brace and am after what size bolt to use in the tower as GSi's dont have them as standard, if anyone has their brace lying around can tehy please measure the diameter of the hole so i can the biggest possible bolt that will fit.
thanks heaps.

[T-onedc2]

If no one answers before hand, I'll check when I get home tonight.;)