"Where would I get one, and how do I know that's what Jesus actually looked like?"
You can find several sources on the web for plastic Jesus figures, suitable for dashboards.
As for what Jesus looked like, the preponderance of depictions of Jesus have him looking like a thin European man, with light brown hair and brown eyes. That image is doubtful
A search for "Real Jesus" will bring up some other ideas of how the Joshua of the time might have looked. It doesn't much resemble the Jesus on most crucifixes, though. Way too semitic.
So in other words, I wouldn't know what he looked like would I? LOL