New Wilwood break pads don't fit.
 

I have a set of 4 piston calipers from Wilwood. I ordered new pads and they almost fit. The hole for the cotter pin on the new pads is off just enough that the cotter pin wont go back in. If I file or drill out the hole on the new pads will that create other problems? Potential for the new pads to rattle around and vibrate, etc...