Yet another question

[topconker]

Kohler K141 carburetor L inlet adapter, what are the screw size that hold the L shaper inlet adapter to the carb?
I tried 4mm metric but it's not that?
The 2 screws are about 3" inch long if that helps.
TC

 

[Rivets]

The K series Kohler engine all use SAE fasteners. 1/4 X 20 or 5/16 X 18