Lost a bolt, what to order specifically? (Shown image is not my motorcycle)

Here's the bolt I lost while riding, might've stripped the bottom thread, because I had tried to put it back in, and it wasn't tight. Once I had it somewhat stable, I left it. Took it out for a ride, it fell out. No idea what to search to find a replacement, I've never really been mechanically inclined and hardly know what it's called.

My specific model is a 2019 vulcan s abs, not the one pictured. And say I stripped the plastic thread, any suggestions on what to do?

NOT my motorcycle, this is another user's who I am using as an example