So, what fits? 17s, 18s?
I thought pretty much all E350/450 chassis had and have 16” wheels.
Regardless, any aftermarket wheel mfg that makes wheels for dually pickups will very likely have what your looking for in several styles. There are a plethora of online wheel retailers.
You may need to search for F350 dually wheels. Although I think those have been 17s (stock size) for years now.
It can be a challenge if you don’t see your direct application by vehicle model. Get the diameter, width , offset and lug pattern of your OE wheels and search by that size maybe.
Or if your only looking to buy from a storefront business, try other tire shops that sell a lot of aftermarket wheels, or 4wd shops like 4wheelparts.