Originally Posted by KamikazePilot
If I'm not mistaken those screws are for the x mount to the back of the motor. For the x mount to the motor mount on the plane you could use servo screws. That's what I would use in a pinch. Good luck.
Servo screws are the perfect size.
You can use #2 round or oval head wood screws but they are a smidge too big and require enlarging the motor flange holes.
3/8" in length is good unless you are using fuel tube standoffs for thrust adjustment - then go with 1/2 or preferably 5/8".