67-72 factory sway bar sizes thru the years/options

is it safe to believe it was the only bar carried up thru the 72 model year until the 73 K frame change? From what I also gathered the part number
Yep. I updated my previous post to enclose the 70-71 and 72 parts book pages

So there are 3 part numbers for all A bodies regardless of engine.

At least 2 sizes that we have proof of.

67 - 2462 838 (0.880" nominal 7/8")
68 - 2535 533 (unknown OD)
69-72 - 2535 534 (0.950" nominal 15/16")