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I had them machined out to 4.775" I have heard where some guys will use a router, hand grinder, and even a hole saw. I paid 65.00 to get them all done at a real machine shop, and happy I did.
Yup the bolt pattern is the same, just the center requires light milling. I also brought mine ot a machine shop to get them milled out. I didn't want to risk screwing them up