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hi, my friend has a set of racing hart c4s he bought off a member on this board. i know the hub size is 66.1mm but any idea what the c4 bore size is? its 2 19x8.5(or 19x9 he cant remember) and 2 19x10.5.
If you can't contact a vendor or manufacturer to get specific info, I would try a 73mm outer bore. That's what I use on both sets of my aftermarket wheels.