There is one available for a 6 mm wire. It is part number 000-540-37-05. You will have to verify that it fits in the plug with the fat wire. I believe it will since the standard wire has such thick insulation.
The weather seals are 000-545-79-80 (4 mm wire) and 001-545-05-80 (4.5 to 6.2 mm wire).
Hope that helps.
For what it's worth, when I need a VIN for a car I don't have I'll look at Ebay and other online car sales to find a car that has the option I need and grab its VIN.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon