Asus north chip heatsink

[imported_oddball]

Hi guys I need some help I am putting on a vantec CCB-A1A on a ASUS A7N8X-E. I have

lost one of the push pins and they are not long enough anyway, I want to put on some

screws and plastic washes with a nut. My problem is I am not sure what size screw will fit

in the holes for north chip?roll;