Thoryota
Observer
I would be scared to machine the center bore out on those wheels. If it was a steel wheel I wouldn't be that scared but since those look to be alloy I would diffidently not machine the center bore. You will loose strength in a key part of the wheel if machined. These older Toyota's use lug centric wheels where the newer stuff uses hub centric. Have you looked into the Method race wheels? They have a wheel that is close to the Ray10.