What Size Screw / Bolt

Appreciate any help with this as I would like to avoid trial and error finding the correct size screw. This is not listed on any Toyota parts site I found. The screw holding the fan shroud to the radiator came out. It is the one below the radiator cap.
2011 Tacoma, 4WD, 4.0L, base model.
Thank you in advance!
(Yes, I know I need to clean the engine compartment )

 

Probably either 8x1.25 or 6x1.0

 

I think m6 1.0, oops, I thought it was something else, yeah could be the bigger suggested above

 

agree M6x1.0

 

that bolt head below your red circle looks like m6. I think the one that holds down something on the passenger side, air filter pipe? could be m8. If it takes a 10mm socket, it'll probably be m6. 12 or 13mm, it'll probably be m8.