You wrote:
> Instead of going thru the asstle of finding a 70mm neck tank,
                                i am thinking about just converting to 50mm.

While some filling station have a a special Diesel pump with a car
sized nozzle, note that you will undoubtely run in to ones with
only the larger truck nozzles. This is why we have the 70mm filler
neck in the Diesel Vanagons.

Cheers,
Martin

PS Tip: After moving to Edmonton I found out that the price difference between
dino and synthetic oil is less in Canada. Now I run Delvac 1 at CDN$6/litre.