Jim,
Try the Rustoleum #7737 Spruce Green, it blends well and I can't tell the difference from the original color on the tractor. It will take awhile to dry though. It is a satin finish and I don't know if you could get a closer color match in a rattle can! I got mine at walmat and I believe that it is a normal stocked item at California walmarts.
For the Red if doing a complete repaint of the sheet metal, I used Krylon Banner Red and it looks real sharp. This paint drys really fast and smooths out real well which makes a rattle can job much easier.