1972 Swinger - 1 1/8" Sway Bar?

My 1972 Swinger Special 318 sway bar appears to be original and it's 1 1/8" in diameter. Most of what I read shows stock having 7/8", so perhaps it is aftermarket. Does anybody know whether the 1 1/8" was a stock item?

I'm going to be replacing bushings and links -- any brand suggestions? Is it worth going for the Energy Suspension poly stuff, or will the basic stuff on RockAuto (moog?) suffice. This is a daily driver, not a performance/race car.