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to get an idea of what you need---knock out the 4 studs---place the 5 stud pattern on the hub and rotate it till the most new holes are in virgin metal----if there are holes to be filled dont fill them with welding rod--cut a piece of solid rod to fill the hole then tack (tig) it into place----as said before drill and tap the studs like they do for race cars---finish the tig welds-----your machinist will charge you some for the time to set up his machine to drill the pattern but when set up it runs like an assembly line----my machinist would redrill all the rotors i wanted free because the setup was done---bob


,, but I leave my original holes there in case I want to go back to small bolt pattern