Here is a run down of cement mixers in N:
Athearn Mack B, high water tank, drive shaft driven.
Athearn Mack R, low water tank, belt driven.
Backmann unknown type, high water tank, belt driven.
GHQ Ford 9000, low water tank, belt driven.
Lineside Mack DM800, High water tank, possibly belt driven.
Magnuson Models Mack DM600, no water tank, unknown drive style.
Wheel Works Ford. No water tank, unknown drive style.
Looking at the photo. The Athearn Mack B has the closest size and style you are looking for. You could replace the cab with a GHQ Peterbilt or IH part. The GHQ cement truck would work in a pinch, but you would need to relocate the water tank and backdate some details and cab. The Magnuson model is very crude and the "centipede" wheel style was only popular in the late 60's to early 80's before tractor-trailer mixers started showing up.
The Wheel Works model is also very crude as it basically is a model of a horizontal barrel laying on the truck frame.