Radiator baffle screw or bolt size?

[Praxiss454]

Hi all,

I nabbed radiator baffles like these some time back, but never installed them. The side pieces connect to the radiator support with standard body bolts, but the top piece and the tops of the side pieces connect with what appear to be screws rather than bolts, something smaller than 1/4-20 it looks like. The holes are stamped into the sheet metal with like, a single thread. I can't for the life of me figure out what size fastener to use. I know I'm not the first person to ask this question here but I didn't see an answer. Hoping someone can weigh in.



I actually took one side piece up to Ace and spent 20 minutes trying to fit every screw and bolt I could into it, and nothing felt particularly secure.