I used a micrometer to measure 2 original 14 tooth gears and the shaft of the pot.
I found:
The bore diameter (pot shaft diameter) is 6.32mm (1/4"). The "6.35" offered on the site would be perfect.
The outer gear diameter was 17.15mm on one and 17.4mm on the other. I think the 16mm diameter offered on the site may not work properly. But it might...depending on how much slop there is. I suspect it may slip when the yoke is twisted suddenly.
I don't think the tooth height values are too important, because it can be adjusted, but:
Tooth height: 6.4mm
Regarding the overall height, the original is: 14.35mm, the part on the site is 18mm. I think there is some extra space in the yoke off the end of where the gear engages the larger gear, this might be OK, you only need slightly more than 1/8". You could possibly grind or dremel it shorter if needed also.
That gear has (2) set screws, but you would just use (1) of them, on the single flat part of the pot shaft.