Along with that, a couple thoughts from someone who has both.
I have a late 56 57 top on my 55. With the lift bar. It is extremely difficult to raise and lower, generally considered to be a two person job. You’ll look a while to find one, it will probably need recovering and a window, but it is nice to have an original.
You can also buy a sort of reproduction from Prestige Thunderbird. I owned one of those prior to buying the original. It’s a diffent set of bows and is slightly different when up. If you want the front chrome header you have to buy that separately (at least back when).
It’s a bit lighter and easier to manage, and works ok. Neither of them are like a modern soft top, but that’s how it is.
I use mine mostly as a come home device if I get caught in the rain. For that, I was probably better off with the Prestige top and the other money in my pocket than buying the original and recovering it.
I’m not sure when the portholes began in the hardtop, but my 55 didn’t have them. There’s a kit to add them, which I did. The hardtop is pretty blind in heavy traffic and the small mirrors (even if you add a passenger side one) don’t help much.
Just a little something to know, and add or subtract from the price negotiations.