I've finally tracked down a decent front 2/3 width bench seat. Obviously these were offered as an option from the factory for walkthrough vans like mine with the "M501" kit. This fitting kit is quite simple, a couple of bars across the walkway to support the seat and allow the seat bracket to attach to something and a backrest support. So I bent some bars to replicate it. I have offered the bench seat up and the tubular seat frame fouls the inner edge of the passenger seat tub, making it sit ~50mm higher at this end - see pics. It won't go down further at this end, even if I sit on it. Am I going to have to chop a chunk of the seat frame out and re-weld? Surely this isn't normally required - do I have the wrong seat? Comments welcomed, especially if you have experience of fitting a bench seat in a walkthrough bus.