Does anyone know the diameter of the 4 bolts that hold the corners of the trapezoidal section of the USS to the frame?

I need to pick up some washers to make the USS and the new Miltek header play nice. Right now, the Miltek cat is rattling against the 2nd (from the front) horizontal brace. I have been advised to space the horizontal brace down with washers so that it will clear the cat.

Thanks!!

 

If anyone cares, the bolts that hold the 4-piece front brace vertically to the subframe are 10mm wide and a little over 30mm long.