No, it has a circular mount that has a pinch style clamp tightening around the shaft where the axle slides through. Thus also allowing you to change the angle of the mount too. I don't care if it has the holes drilled or not, my luck it would probably have an annoying whistle going down the road!!! All I can tell you about it is that it is billet aluminum, it has two pieces, clamp and main arm.
I also wondered if it would be easier to make the mount piece, one large billet piece which was the caliper relocator and plate arm in one; but hey maybe I'm just reaching here!