When I bought my son's 2000 tj the tcase skid was falling out. The frame where CAs and antisway bar attached were also rotted on both sides. I ordered both center and both CA sections.
I installed both CA sections first.
I measured from the existing rear CA mount to the front CA mount so I had a reference.
Then I started on the center sections, again measuring. The centers I did have to do some trimming
As you can see they come with the weld nuts for skid.
A few tips
It is recommended to remove bottom inch of the frame being repaired. Plasma cutter worked great for this.)
For all the work I had to do, I just raised the tub off the frame. I also had to change fuel pump and upper shock bolts. While I was at it also installed 1" body lift.
IMO, if this repair is done correctly, the frame is as strong or stronger than factory.
Those are my experiences with this product.