Sportscraft off-center pivot. You do not have to open the door to swivel!
These swivel kits will raise your seat a little over an inch.
If you have the factory auxiliary battery installation in a 02-06 Sprinter, you will need to shim the seat swivel an additional inch in order to clear the battery (this modification is not recommended). Since the factory battery is a wet cell, it cannot be repositioned. With an AGM dry cell battery, you can lay it on its side and eliminate the need to shim the swivel.