clutch head screws

Harbor Freight sells a drive-bit set that include 3 sizes.

Most of the reproduction parts companies sell clutch head bits/drivers.

A regular flat blade screwdriver will work, but make sure it is a tight fit in the head of the bolt/screw.

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=949898

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=741689