Thread size in carraige

What is the thread size of the holes on the left side of the DW611 carriage? I’d like to use them as mounting points for my dust boot. It does not seem to be the same as the thread that clamps the spindle.

https://workbench.grabcad.com/workbench/projects/gcl5zpCuwqCXWLvYktLQBc-2IHvossNo37ycTOkzg6gREW#/space/gcvs_XeRNVzNkfG_tFTAMd0C2lBbCsLcagOxXb1Jlki0kT/link/186418

Drawing says M4 tapped just like the right side holes.

Thanks. Mine must be stripped because an M4 fits very loosely.