I finally found the right screws. They are stainless steel and fit the countersink nice. They have a nice chunky head. They are bridge screws for a telecaster. The dude i bought them off searched everywhere and found them in the usa, i just searched ebay.
I put phosphor bronze 13s on it originally but they snapped with the taking them off and on so have put some electric 9 guage on there to try. Pretty bendy compared to the 13s and sound weaker so i've ordered some phosphor bronze 12s to see the difference compared to the 13s.