Yeah, you are right.
D coupler measures: 3 13/16"
A coupler measures: 5 13/16"
G coupler measures: 5"
I still think you'll be fine. The Kenmore is similar in size to the Sanyo model. (See attached image)
http://www.micromatic.com/keg-refrig...d-BC-1206.html
Your keg is 23 3/8" tall, plus 5 or so inches on coupler, you're still under 29".
Again, to be safe... I would pick up one of those elbow fittings I mentioned above.
The only time I've had a problem, was with a built-in undercabinet kegerator. These tend to be shorter units, because they fit under the counter. My interior height is 27 7/8". I was BARELY able to get a keg of Spaten with an "A" coupler to fit. I had to use the elbow fitting on the coupler.