It's been my experience that "standard" M1A stock liner tips only work on Chinese rifles sometimes.... the spacing in the screw is correct, but the reliefs in the stock is not a standard size...
I have a modified flat head screw driver that I filed down to fit Nork stockliner screws, for the ones that don't accept the standard driver tips.
I have also never had much trouble fitting Chinese stockliners to wood stocks like the Boyd's. That said, all things Chinese require a little tweaking to mate with American stuff....
John