If you can pony up a few bucks, PPG has a camera that will take pictures of any color paint, and match it.
Shoot the red tractor paint on a piece of sheet-metal, and they can match it in single stage or BC/CC no charge.
I'm sure I have some more in the budget for some "better" paint.......but HOW MUCH MORE will it be? Do you know? I need to see if there are any PPG dealers in my area. I'm sure there are.