!!!SOLD!!!
Bought this from a guy on Etsy who 3d prints these. It was like $40 new. Honestly the best money I ever spent on the truck, and I'm surprised these aren't all over this forum.
Toyota 4Runner Yeti Cupholder Insert 2003-2009 4th Generation | Etsy
You just pull out the useless center spreader thing and pop this down where it was. Perfectly fits Yeti containers. They will not move at all.
I traded in my truck, so I don't need mine anymore. Like new. $20 shipped.