Did you get the correct swivel for your van? The swivel should be such that the driving position is the same as stock (yet about 1" higher), but the seat will shift towards the center of the van when facing rearward. ie. the swivel point is NOT centered directly under the center of seat/pedestal.
I bought some from seats4less and they were fabricated incorrectly. It took me quite a while to figure out how they were supposed to work and why I couldn't shut my doors with the seats facing rearward. I ultimately built my own out of a used generic R$V swivel making sure the swivel point was located appropriately.
the driver is limited by the steering wheel which is a bit more than 90 deg and plenty enough for me.
does your driver seat face the passenger seat? do you think an offset would increase range?
I am trying northern tool seat swivel #5006 on the passenger side, don't know how it will go.
Thanks,
Tod
'09 express 1500 H1(awd) LT