I am in the process of swapping in an axle into my '79 and I've run into a snag. I needed the bolts that attach the caliper mounting bracket to the axle, so I ordered them from Mazda.

They sent me the wrong ones.

Now I've got a week and a half until the season ender autoX, and Mazda can't get me the proper bolts in time. If anyone here has the proper bolts rolling around in their garage, or can point me in the right direction, I would be very grateful. The axle is from an '81 GSL, and I need the four bolts that attach the caliper mounting braket to the axle housing.

 

I may have some, Ill look.

 

Could I tap this out to a different size? Maybe go to a 3/8th inch bolt instead of metric.

 

I wouldnt. Youd have to remove material from the only thing holding the axles/brakes etc in.