No 66.5 cars in any line up that I know of.

What are the first 6 digits of the VIN? Does the SO number match on the trunk lip?

From what you are conveying it sounds like a car made up of several cars' parts. I have had quite a few '66 Coronets and they all have been pretty much as the dealer brochure depicted. There are some early-late differences that seem to follow supply chain changes and of course different plants.

Ans here I was hoping you guys where making a 66 Coronet SS car or something lol.