Didn't ask about other makes specifically, BUT I have heard rumors (I talked with Barry up in PA) about Goodmark reproducing sheet metal for other Mopars. And yes, fenders are in the works for both the Challenger and the Cuda. Imagine being able to buy nice, new fenders!
What has surprised me most is the time and money involved in replicating these parts. The tooling cost for these quarters is probably over $250K!
My suggestion is that all of us who need Mopar sheet metal talk with the Goodmark guys and let them know. I have been told by a couple of guys who do restoration work for a living that the Goodmark metal is so good that it fits just like original sheetmetal. On the other hand, the other guys are making patch panels and stuff that are more work than they are worth!
Us Cuda guys will have to wait about a year for the Cuda quarters to come out.