I could be wrong, but if you’re referring to the standoff screws I think they’re m4x40 pan head. I’d have to check but you can find em locally at Fastenal or online at McMaster Carr/Amazon/EBay. I’d recommend picking up a set of m3 screws while you’re at it, they come in handy for many printable upgrades and models in general

Also I found a link on Amazon, it comes with the springs and knobs as well.