If you can remember far enough back I started fitting ALFA 75 Milano seats to the 126, they fitted ok but are very heavy. Saw a Bedford Rascal van in my local scrap yard the seats are a perfect fit. Only had to fab a frame to fit them to the 126 runners. The look really good, they are the high back versions. Will post some photographs over the weekend. I also took the headlights and they fit well, I will fit them soon as MOT is up in a couple of months and one of the original headlights needs replacing.
Ralph