The biggest problem with that is that UPMan has noted:
From what I can tell, the potentiometer likely falls under the unique to GRE model part.
Pots are about as close to a commodity part as you can get. A simple search on the mouser.com site shows 268 PAGES of pots available through them (about 7,000 different kinds). The other thing about a potentiometer is that the replacement doesn't have to be an exact match. If the value is slightly off, the worst that can happen is that the control may need to be a small fraction of a turn different for the same setting (chances are you'll never even know the difference).
The important things are:
Mounting - how does it connect to the circuit and how is it secured to the case
Shaft size(s) and shape(s) - how do the knobs fit
Resistance - max resistance the pot has
Taper - how the variable part changes as the shaft turns (audio, linear, etc.)
One or multiple controls - Volume only or volume, squelch, power switch, ...
Shaft length - how far the shaft extends from the control (note, they're easy to cut down to size if needed)