It's been a loooooong time since the last update on these hasn't it? There's good news and bad news about this project and I've been waiting to post an update until I reached a certain point.
First, the good news...
I have both the driver's side and passenger side mounts completed. They sit perfectly on the van, all of the angles work out awesome, the view out of the mirrors is incredible and the truck mirrors just look hot on the new body style van IMHO.

I still have a little work to do on finishing the plastics but both sides are roughed out and fit very well. Just a few hours of filling/sanding and painting left and I'll be ready for final assembly.
Now the bad news...
After dozens and dozens of hours of work trying to get things right with my mounting design, I scrapped it and basically just modified the truck mirror base. While I do think the design and all of the parts I made would work fine for mounting these mirrors to the van, it would require a great deal more effort to design and build the plastic to fit those parts. I put quite a few calories into figuring out how to manufacture all of the parts inexpensively enough to make a conversion "kit" but I kept butting up against this plastic shroud and how there is really only one way to do it right....and that method requires a ton of $$ up front. That one snag makes manufacturing these pieces cost prohibitive (unless of course you were to make thousands of them at once). I won't be pursuing this design any further though because I just don't see a good enough return to justify it.
Modifying the truck mirror base isn't without it's challenges either... You first need to start with the die-cast base (which only comes on the full power mirrors) and cut/drill/machine some features then mount it to a fabricated adapter to fit the van door. Then there's marrying the plastic from the truck mirror with part of the van mirror plastic...Not difficult in and of itself but notice that you're cannibalizing a set of van mirrors in the process of modifying the truck mirrors. Then there is the sanding, filling, sanding, texturing, painting of the plastics...hours of work in just those pieces. I forgot to mention that the initial tear down of the truck mirrors takes extreme care and it is not only difficult as hell to do, it is also fairly risky because the parts are not individually available for purchase and many of them are not really designed to be "disassembled". There is a very good chance that parts will break before you even get anywhere.
So to make a long story short... This project has turned into more of a one-off proof of concept than a pre-production prototype. I won't say that it can't be done because it most certainly can. It is just very labor intensive to do one set at a time. The right way to make these for others is to mass-produce parts but I'm just not in a position to take that risk.
Sorry guys...I tried.
