Bryan, I'm guessing you know this for a fact because he got it from you?
The 243 was my first guess but it looked too narrow based on pictures I found online, however when I took pictures of mine they look more narrow so it must just be the camera perspective
It's 17 inches wide exactly by the way, I was too lazy to remove it and compare the tube chart...
The 8-T-243, a set that actually looks better from the back than the front.