Found a dual door on carsales.
Link https://www.carsales.com.au/private/details/Volkswagen-Kombi-Transporter-1969...

That's an amazing van , I just picked up a 72 DD which is pretty good but wow this thing is the ultimate !!

I know right,
I was considering buying it myself but won't have any funds for it or the restoration as I already have Blaster to restore.