I had a kiravans double swivel and a rib drivers swivel, bit of a faff but easily doable, it was a necessity for me to have both seats swivel.
Now on factory california captains/single seats with oem swivels, so easy and quick to turn both round.
One of the best upgrades I've done on the van, I thought I could live with a double but too much faff, too uncomfortable to sit on (even with the extra layback bracket), too high off the floor and no easy way/walk through to get to the rear of the van. Obviously no good if you actually need 3 seats up front of course