Quick question,,,,Does anyone know when the front knuckle on HJ45 changed the size on the steering arm and bottom bearing cap? I have a 1980 HJ45 (03/80). I ordered a new steering arm and cap for my left side based on that year. The one on right is what was on the truck, and when I ordered based on year, I got the arm on the left. It's entirely possible that the truck has an older front axle by a previous owner I guess,,,or maybe when truck was built. they still used some older axles. Just curious if anyone could shed some light on this.