A four headlight truck is basically a holdover 1964. So dimensions would be same as earlier. Does your truck have a nut on the end of the axle shaft?

R.

OP: '72 was the first of the new body style and had one-year-only front end suspension parts, so the fact it's a '73 makes it more desirable. As far as bed style, the short wide bed is in demand, too. I wouldn't stop the deal over a bed style issue. The truck is 44 years old, they don't come around in decent shape that often.
I looked at an '84 from desert SW and was disappointed to have floor rustout. I was told here that that's common as drains get plugged and water gets inside. It's not a deal killer, but is something to check for.