I purchased the bumper overriders from Hanes Hotrods & Cobras,
HanesHotRods $160 a pair plus shipping.
They arrived and match the size/shape of the CR part exactly
They're made of SS except the welded in mounting plate same as the CR part. The finish/polish is done well so they're good looking parts.
They're different in that there's only 1 mounting plate versus 2 and the mount holes are closer together. I knew this before I bought them.
My plan is to make a bolt in mount plate extension. I thought about welding in a 2nd mount plate but I'm worried the weld backside would warp the visible surface and I'd get into a bunch of finish work and polishing as a result.