All CB mounts utilize one of the following two types of coax connections:
Mounts that accept a standard PL-259 coax end are very common, and you'll be able to identify them from the threaded cylindrical bottom of their stud. Make sure you purchase a coax with two PL-259 ends to ensure compatibility.
Lug style mounts will accept both ring style and terminal end coax, which are ideal for when space is limited or you want a low profile installation. If you get a lug style mount, just make sure to get a coax with a ring or terminal style ending to ensure compatibility.