I just bought a desktop AT case and I can't remember what type of standoffs go in the round holes. I tried using the common 6-32 standoffs but they're too small for the holes.
There used to be nylon standoffs that you would attach to the case/motherboard holder with a screw. I can post a picture when I get home.
Don't know if those are meant for thus case though.
Those are possible candidates I had in my baggie of standoffs.
Edit: Welcome to the forum btw. 😀
Thank you for the help. I'll go look for them on Ebay.