compomotive HB spinner bolt size

Don't trouble yourselves if it is any effort but if you know off the top of your head it will save me driving miles to the garage before I order some online... I have a set of the HBs and some 'fake' spinners. They are the type that are fixed with 3 bolts fixed the face of the wheel rather than the grub screws to the side.

many thanks Alan

p.s. I hope the car (still in primer) will finally be on the road tomorrow after 3 1/2 years...
 
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