I recently had the Scheel-Mann Vario-F seats installed in my 2011 E-350 EB. First off, you can't have armrests on both sides, as they won't fit. Secondly, I found out that there are two different brackets for the armrests. One is a flat bracket and one has a 3/4" dogleg in it. I ordered my seats with the right armrest for the driver's seat and the left armrest for the passenger's seat. There was not an option during the ordering process to pick which bracket, and there was nothing I saw on the Scheel-Mann web-site to indicate there are two different brackets.
My seats came with the 3/4" dogleg brackets and the doors would not shut with the seats turned around. It took a bit of work to find out that I needed the flat brackets. Once they were installed, both seats would turn 180 degrees and both doors would shut.
Friends Don't Let Friends Do Stupid Things Alone