I have the Aluminum Wheels you are looking for and I just went the trailer to find any Mfg info, none. I also checked the list of OEMs in my manual, there is no information there on the mfg of wheels and/or tires either.
I would say, just go to you local tire/wheel dealer and see what they can come up with for you. In fact, if it was me, I may intentionally stay away from OEM equipment...seems the aftermarket stuff is often better quality than what was originally installed.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)