the holes are 8.2mm and the master cylinder is 9 mm thick. (hope that helps you to select the bolts) I am planning to use M8 but not sure of the length as I haven't fitted any pedals yet. If you haven't got your master cylinder yet give AK automotive in rowlands gill a call (you can find them on google - really cheap and 1st class service). They also race mx5's so can tell you how to make them go and stop well.
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Click to see my build photos on Flikr
http://www.flickr.com/photos/67112582@N03/
Saturn MX5 Based Chassis, Limited Slip Diff & 2.4 Quick Rack.
Build cost.... seems to be spending more on tools than car bits at the moment! (they will be handy in the future though).
Car iva'd and passed 15/08/2014. Finished weight 572kg.
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