Can't tell for sure in the picture - but it looks like the stock bracket is bent. The sides look bulged out. b They should be straight up and down.
The RE bushing has a metal sleeve inside it - the ends of that sleeve stick out just a tiny bit on each side - 1/32"?
The end barely fits in between the bracket sides - or should.
When you tighten the bolt, the bracket bends inward and squeezes that sleeve. There's no room for the bushing to get out or even try.
Probably easy to fix - remove the arm, swing it out of the way - bend the bracket sides so they are straight like there were when new. Hammer should do it, or an adjustable open end with a snipe. No heat, you don't want to take the temper out.
Then push the control arm back in place - you'll probably need some liquid dishwasher soap to get the rubber to slide back in.
Tighten the bolt - use Locktite, and double nut it (both ends!)
Just a little work, but no cost. RE will probably tell you the same.