And just in case someone does not know - the passenger and driver seat bases are not interchangeable. This true because the floor bolt pattern is different, and many of the vans might have a OEM control box mounted under the driver seat that necessitates the box style seat base vs flat plate.
Any interest in a group buy for swivel seat bases?
I have a "universal fit" swivel base left over from my conversion. I don't know what "universal" refers to, but it's got a boatload of mounting hole options. $25 + shipping from salt lake.
Here's an even sweeter deal: I'll give it free to anyone who can put me in actual contact with Ramsey at Agile off-road.