I just installed these items, super stoutThese are what you need 2nd one goes behind the cross member gotta pull the gas tank to install but it makes everything really solid sorry No. 2 is the outer there is also an inner that is the one you pull the tank for
https://genright.com/products/rear-frame-to-bumper-tie-in-bracket-kit.html
Outer
https://genright.com/products/rear-cross-member-plate-tj-lj-yj.html
the inner
https://genright.com/products/inner-reinforcement-plates-tj-yj.html
The Inner and the Frame Tie in Brackets are what I used, I have been happy so far