If you've had problems finding perfectly-sized gags, inflatables may be the way to go.
This heavy-gauge inflatable rubber gag has a 1½" (3½ cm) bulb-shaped head which can be slowly inflated to the size and shape of a small apple, up to 2½" (6cm) in diameter. Air pressure is controlled by a bulb pump which is connected by a tube about 12" (30 cm) long.
The gag is attached to a leather adjustable strap with a lockable buckle. The buckle will also work without being locked.
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Entertaining product, minor concern review by Jennifer on 3/11/2017
I love this gag. The feeling is amazingly debilitating, but it is relatively comfortable considering what it is intended for. You will not be able to speak. If you are able to make half-way relevant noises, you are doing well. I didn't have any trouble breathing, though. Drooling will occur, so keep that in mind. It is fun, but it could leave a mess.
The only concern I really had was with the panel that holds the gag in place. My partner noted that it seemed to be shedding, and it is somewhat difficult to clean, so I am a concerned about the item's longevity. So far, it is a minor concern. Even if it only lasts a year or two, I'd buy it or something like it again. I can't imagine myself being without an inflatable, lockable gag again.