Surplus center about the widest choices.
I don’thave the file here, but search online to find the diagram for calculating displacement of a gear pump. By measuring across the gear set in two directions, and the width of the gears, you can determine cubic inches per revolution. The formulas are really close and gear pitch doesn’t affect them much.
Once you know CIR, picking a pump with rotation direction, mount, and other features is fairly easy.
I assume it is a single section pump as a two stage would do bad things with an overrunning saw motor load. Are the two loads in series, power beyond valves? Or is it two separate gear sections, one for cylinder and one for saw motor?
Why did the shaft fail? Huge pressure spikes? Metal through it jammed gthe gears? Or side load on the shaft, which is the most common cause. How many hours?