Hi Rob,
There were recently some topics about the same thing.
Do you have a console in between the seats now? That could possibly be removed, but won't the handbrake be in the way?
I have three seats in the front, mine is a very basic Euro version (LHD). There are also 4 bolt holes in the engine hood to take the middle seat. They should be visible from underneath perhaps, if they are not covered in sound insulation. I guess every van will have it, but it is hard to be sure.
It seems there are some different part numbers for the engine hood (service hole) cover, so it is hard to say.
Are the ones on Ebay specifically for this model?