That was my guess as well. I took it in to our local Les Schwab wheel & tire and got a blank look when I told him it was 5x4. Then got told it would cost $300 per wheel because they would need to be custom made to get the offset needed to fit.
I'm in the works with a, relatively, nearby auto shop that has a set of front spindles and an 8 1/4 rear end I can swap in to give me the 5x4.5 pattern and get me into some front disk brakes.
Before anyone goes off that I should be getting an 8 3/4 I don't plan on doing anything very high horsepower. Just trying to make it into a safe daily driver on a slim budget. Right now it rides like an old pick-up truck... and sounds like one too.
You have a great looking, solid looking, ride there. I really like the color combo. I'm not completely sure about the Hemi orange mine is...