Usually when you add a rear bar you need to increase the size of the front one to keep the balance correct. check The size of your stock front bar and see what size they recommend to match your new rear bar.
At least that is how we did it when we were younger.
Now when it comes to end—links.. There are end-links and there are end-links.
My ‘03 came with plastic/fibreglas/molded? End links.. it now has metal end links from a C6-Z06.
The people that sell the bars may have some better links than GM.. not sure what they put on the C7s.
good luck.
graham