coincidentally I had a discussion with a dealer today when looking at a Kombi, the single passenger seat didn't have arm rests but the drivers seat did, I thought this odd and asked why??
I was told that there was an option available for drivers side armrests which when selected built the van with drivers side arm rests only, I was told by the sales guy that by not selecting drivers arm rests you got both, he told me it was an issue with the VW order system but as they were supplying exactly what was ordered they wouldn't correct it.
apparently it caught a lot of dealers out before it got corrected.