Koehler socket size

[skip49]

Didn’t realize until rummaging through my tool box, that my serrated head socket selection is severely sparse.
Could someone tell me what size I need for the valve cover screws on my
Koehler 25 horse, 7000 series, KT 740 ?
Thanks,
Skip

 

[StarTech]

T30

 

[skip49]

T30

Thank you sir