It's the factory OEM seats with OEM fixing using the main chassis as support beam. And the angle gussets in there firnextra supports which are original parts. These came out of a new carevelle
@Sean O Leary did you have to get the glass for the rear side panel made up for you or did you but a window kit. Interested in doing this on my Kombi in futureStuck on side windows at rear and put film tint 95% on rear doors turned out very well