I have not found anything in print which guides you, step-by-step how to remove/install this vent.
Those early side vents are spring loaded and are a challenge to take off and put on. My suggestion is to take it off and put it on repeatedly until you are a master at it before you prime the cab so that you can do it with your eyes shut once you have everything painted.
Carl


1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission