Help I lost my nuts...lol

I haven't worked on a front end in decades, so I could be off-base, here, but aren't those nuts kinda special looking. I think they were self-locking, too.

Yeah but im just gonna put some lock washers on them. Im not paying premium price for a few nuts..never had any come off ive put on lol..some people go crazy over a few NUTS..pun intended