The AVRI trem uses six of the 0015610049 screws:
SCREW SMAB 5 X 1 OHP NI 0015610049
https://www.fmicassets.com/Damroot/Orig ... 6-2017.pdf
Riley confirms that they are #5 screws and 1-inch in length.
https://darrenriley.com/store/fender-br ... 015610049/
They should be available from Fender dealers that carry a full parts range:
https://www.fender.com/en-US/parts/elec ... 10049.html
But the screw size you have used (on the right in your pic) looks to have a larger diameter than the AVRI screw (assuming that is what the screw on the left in your pic really is) - a #5 screw has a nominal diameter of 0.125 inch/3.175mm. Which would explain why the new screws didn't work as well in the (now slightly bigger) holes in your guitar.
So the first option might be to find a stronger steel version of the screws you broke. Where did the '6 screws kit' come from ? Alternatively, a common fix for guitar holes that are too big is to glue a toothpick into the hole with wood glue (pressed hard against the hole wall), wait until the glue dries, and then use the correct screw. That's often used for strap and pickguard holes. But as long as the correct #5 screw ends up firmly held in the hole, it should work OK for trem screw holes too.
"I just knew I wanted to make a sound that was the complete opposite of a Les Paul, and that’s pretty much a Jaguar." Rowland S. Howard.
