'66 K20 Wheels & Hubcaps question

[Clanky]

Hello,
I recently found my dream truck, a '66 Chevy K20. This truck has 17" wheels with the 4 nubs. Do these sound like the stock wheels? I'm keeping my truck bone stock and I'll of course have to have hubcaps. Did these 17" wheels come with hubcaps? From my measurement they would be right about 11-3/4" in diameter. Do any of you guys with these wheels have hubcaps on them? Are they 11-3/4" in diameter? They sound huge.
I've seen a few posts where guys mention 19.5" wheels. Were these an option? I'm guessing they are pretty hard to come by these days and high dollar? Man, I bet they look awesome. If anyone has a truck with these behemoth wheels please post a photo.
Thanks much,
Karl