Screw types: https://www.fastenermart.com/mm5/graphics/00000001/headstyles.gif
Round topped screws typically add another mm or 2 which will cause the IS-60 to conflict with the side panel: https://c1.neweggimages.com/ProductImage/A59T_1314382079850988127JINX6xK8L.jpg
Round topped screws typically add another mm or 2 which will cause the IS-60 to conflict with the side panel: https://c1.neweggimages.com/ProductImage/A59T_1314382079850988127JINX6xK8L.jpg