I've found that REALLY old TVs might have an oddball one, but most recent ones do.
The one in that ad would likely work. You should ask if you can check it out first, and see if you can read the tube label off the back of the tube thru the vents. Then compare that number in the B&K Adapter listing to see if it's compatible with a CR-23.
If you get really lucky like I did you won't even have to swap the yoke, just cut off the ends and splice together.