Ed,
Looks like those nozzels are TEEJET 11004 VP. Red. I just guessed when I bought them 5 or 6 years ago. They fan out about a foot at a foot off of the ground. I only use it for broadleaf control. I don't have much trouble with overspray, but I would urge calm winds.
I was using this tank on a carryall but it made the tractor so long for maneuvering. Much easier on the front. Also, if the tank was anything more than a 15 gallons I would have to put some weight on the back. (Small tractor)