Just got new 2016 PM. Left rear door has license plate nylon mounts that exceed standard plate mounting hole pattern width. Is this for some type or Euro or Mexican plate? Is there an adapter to bring the hole pattern in line with US standard? thanks.
My 3500 EXT didn't have a license plate mounting bracket either...I bought one at http://stores.revolutionparts.com/stevewhiteparts.com/
Part number #68223757A (License Bracket) $26.02. I was so confused thinking it was some weird Euro style license plate prep. When I got the mounting bracket it fit over the plastic inserts on my van and I was able to put the license plate on, no problem. The part came with the necessary screws and installation instructions for the bracket and my license plate. Hope that helps!!! The website has everything you could need for a Promaster... keep it handy if you find more odd omissions to your vehicle.