Looks like I either didnt tighten down the bolts tight enough, the bolts were too short or the threads were stripped already because after 5 or 10 miles when I hit the brakes I had my drivers side rear wheel fly off.

Luckily the new brakes are OK and after bending and banging the brake dust shield back I cant even tell anything happened. I now have a set of stripped wheel bolts and the threads where they bolt in to are damaged as well.
As far as I can tell where the wheels bolt in to on the rear is integral with the axle assembly. Can I drill out the old holes and tap them out to accept a different size bolt or am I better off just replacing the rear axles?