I've been working on a tooling Design project for a unique part, basically I'm taking a cast metal piece and drilling and reaming it to be used as an oil flow passage for a Harley Motorcycle. I.e. I'm the (student) engineer that is designing the jig/fixture device to be able to do the work. Everything was running smoothly until I came across a hole that has a pre-reamed Diameter (Theta) "X" and a reamed diameter of (Theta) "Z." Each of those come with a tolerance of +/- 0.0005. Does anyone know what size they are (roughly)? Or does anyone know of a link that has a list of diameters?