Is it absolutely required to have frame tie ins?
I bought one of Dirtworx's original bumpers (looks like yours but was 10 years ago when he was on ebay) and bolted it up on my 2k TJ that I had at that time. I yanked, towed, and got yanked with that bumper for years and it never flinched. They didn't have frame tie ins for TJ's back then or at least I never saw them mentioned on the forums.