Which included screws do I use to install a psu in Carbide 200R case?

I'm building a computer to donate to a local organization. I bought an 80 Plus Bronze rated, 550W, power supply to put in the 200R case. Incredibly, the power supply does not include any screws to use while installing it in the case. The PSU manual states: "Use the screws provided with your case to install the power supply in to your computer," so the lack of screws is definitely intentional on the PSU manufacturer's part.

 

The 200R's manual states (on how to install a PSU): "Align holes & secure with screws," but it does not identify which screws to use. I imagine the intent of that statement was to use the screws that probably came with the PSU.

 

Which of the 200R's included screws should I use? The choices are 1. short fan screws, 2. MBD/HDD screws, several of which I''ll use to install the motherboard, and 3. ODD/SSD screws. The other parts, including rubber fan mounts, long fan screws, cable ties, and two mb standoffs (not detailed in the manual,) will obviously not work.

 

I have very poor fine motor skills with my hands, due to cp and age, so I'm fearful of stripping out the screw before I realize it's the wrong one to use.

 

Thank you in advance to your kind assistance.

Usually they are black screws with philips socket, and hex head combined. rather coarse thread typically.

Here's a photo of what they look like in inox version, just to see the shape better :

 

Thanks for your reply. As I did further research, I came across mention of screws identified as 6-32. Through process of elimination, using other sources, I was able to conclude that the screws in the Corsair accessory box labeled "MBD/HDD screws" would work, and they did. Thanks again for your help.