You can try contacting
Thor Motor Coach at
http://thormotorcoach.com/contact.php, or call:
Customer Care
(877) 855-2867 Retail Customers
Have the following handy: Year, Make, Model, Vin#, Stock # (if available. look on the driver-side B pillar), Body # and Serial # may be the same.
Tell Thor what happened and that you need a starting point for replacing the unit. As them if they can tell you the make/model of the installed unit that was stolen, and where you might be able to buy a replacement.
If you're lucky, Thor will provide you with some useful information. Thor will likely say the following:
We don't deal directly with or sell directly to the retail customers. You can contact Total Value RV at (574) 262-4460 and ask for Steve in Parts. They are located just down the road from us here in Elkhart, IN. They can perform part look-ups into our inventory database for your motorhome. Rotsa-ruck, Astro.
I know that because that is what Thor told me to do when I needed a replacement shower pan.
BTW, Steve at Total Value RV is really good with assisting you. I give Total Value RV two thumbs up.