Out of curiosity why don't the push pins fit your motherboard?
Got a budget in mind? Cheap as possible? Or looking to heavily overclock?
EDIT: I *think* this is screws - http://www.overclockers.co.uk/showproduct.php?prodid=HS-001-CS
See here - http://www.corsair.com/media/cms/manual/Corsair_A70-A50_Mounting_Information_-_Intel.pdf