23. The wide-version A4 seats just barely squeeze into the small cabin of the XJ, but they do fit and retain all functionality. I know this now, only after trial and error. You see, the A4 seat isn't the first model I tried. I had actually ordered the Baja XP fixed suspension seat originally. Though I was able to get the XP seats bolted in, they sat much too tall and upright to be reasonable for a daily-driven vehicle.
These new A4 seats have low bolstering for easier ingress and egress, and the reclining feature makes these much more suitable for multiple body types.