We added a swivel to ours and love it, it was from the link below. You will be amazed at how heavy it is, the holes line up close but you can get them all started before you tighten them down. I have a friend that had the fancy "sprinter shop" one and he likes ours better, no squeaking. Be advised it lifts your seat 2" and for short legs a foot ottoman or box helps the passenger. I felt the steering wheel would be on my less if we did the driver. Last thing, we can spin it with the door closed, the mop pocket in the door now has a healthy scratch but it is the same over and over and not getting deeper.
sprinter swivel seat bases,driver,passenger van bases