.....okay then, let me rephrase a reply. Letsoren, one of the things you can do is go out and take a photo of a real tractor, then scan it and tweak it in Illustrator, Corel, or one of the many sign programs. It's very easy to do. I can show you how if you'd like. And that way you get the EXACT image you have in mind as well as owing it for yourself.
~Gear