66 Dart sway bar

Mike Martin & the Rally Bulleyin list the early sway bar as 0.82" diameter. p/n 2071 652
At one time Mopar Performance sold a .88" bar for the early-A, p4286695. But finding that one now will just be lucky. It might have just been something made by Addco or similar or they might have designed their own. I've not seen one in person.