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What I did when I redrilled mine was got a 1/2" or 9/16" drill bit, a 1/2" grade 8 bolt with a good size shank. The shank fit very tight in the to hole that lines up in the 4 lug and 5 lug rotor. I butted the rotors up. Installed the bolt (you will probably have to get some washers to cover up some of the shank so the nut will torque) . Then I aligned the center bores (I believed they are the EXACT same size). I torqued down the bolt. Then using a drill press I drilled the other 3 holes (using the 4 lug rotor as my guide) into the 5 lug rotor. They came out perfect.
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