LEE Revell, I've done a lot of looking on Amazon, but I hadn't tried RockAuto as yet. I'll be sure to check them out.
ccbreder, I think I'm going to have to do what you suggest. They don't appear to be listed as cross-compatible, but if I can get the base trim to cover and match up, I can probably adapt the mounting holes underneath. I may have to manufacture an adapter plate, but it's doable.
highdesertranger, yes I'm referring to stock Dodge mirrors. The vans only came with a standard side mirror, while the Dodge trucks were available with a factory towing mirror. I had these on a truck I used to own, and they were far and away the best mirrors I've ever had for towing a large trailer. I just wanted to know if anyone had ever tried this. If not, I'll look into it on my own and post the results when I find something out.