Have you noticed this 319?https://www.classic-trader.com/us/cars/ ... 1964/46680
Is your project to manufacture a transporter for the 500E?
Ok, I am not 100% sure and vaguely remember that there two guys on this forum over years who are/were from Poland.
Forum member " stomek ' had a long wheel base for sale at one stage. His facebook page is Old-Merc-Garage. He maybe able to help?? https://www.facebook.com/Old-Merc-Garag ... fref=photo
Also, years ago (??) another Polish guy had a short wheel base L319. To extend the chassis, he cut the rear chassis and welded in a new longer section to make a transporter. I cant find his link but Im sure its still out there in the interwebs. This is the only link I can find at the moment, but it looks like he sold the 319 transporter . http://heavycherry.com/imgs/a/b/x/l/g/m ... _1_lgw.jpg
And thirdly there is the other option if your in the US. The prices is, um.... MMMmmmmmm. Some serious money still if you were to extend the chassis. http://www.ebay.com/itm/1967-Mercedes-B ... 7675.l2557