What year is your SS?
OE is 26mm front, with 28mm rear for 2014.
For 2015>2017, rear is a different size (25mm) and design, which does not back-fit to 2014 without changing rear lower control arms and possibly converting to Brembo rear brakes.
Camaro (5th Gen) 1LE front bar has not been confirmed to fit, and probably will not work.
The 1LE rear bar is the 2nd design (fits 2015-2017 SS), but requires spare wheel tub modification for clearance. It is larger than the production SS rear bar.
Aftermarket options are limited:
has a 26mm adjustable front bar (solid)
has a 29mm adjustable front bar (hollow) - listed for G8, not SS, but should fit
also has an "extreme" drag-racing oriented rear bar for Camaro that would probably fit with spare wheel tub modification.
There just aren't many options--someone may be aware of others.
Not directly applicable, but you may find THIS