Thanks for that!
Looks like Fabcraft has more details on their site:
https://fabcraftmetalworks.com/produ...sisch8-0520-2/
I was hoping the reprint of the special equipment catalog for '63 I ordered would have listed a rear sway bar as a factory option. Sadly, it seems to deal with engine and transmission options, mainly, and a few interior things (gauges, consoles), but no suspension options. I would have expected the towing package to be listed, for example, but I'm not seeing that. Perhaps it's in my main sales binder? Some other special catalog?
According to Fabcraft's site, 62-64 require plates to be welded. as my goal is to be as "factory-correct" as possible, I'm wondering whether the rear stabilizer was indeed offered for these years. The AMA specifications show no rear stabilizer available, and the HD stabilizer option (front) on the option sheet was for the police option only (no mention of a rear stabilizer).
More research needed. Good to know, however, that I have front and rear options, even if these may take a bit of work to install.