The only thing I can figure is that the stock AC cover is bigger in diameter than with the other models and may get in the way of the Rinehart pipes. If that's the case, you can mount the pipes and get a different AC cover.
The AC cover is too big. I solved this by getting at first a "Football", but now have a heavy breather.
Rinehart is not the only one that states it cannot be used, Sampson, and a couple of others state the same thing because of the AC. I have found this out because I am also shopping for pipes, will be doing the 103 in a couple of months. I think the black wraps look good, V&H makes a nice set.
Something I just did and it looks awesome, so it may be a very nice low cost option for you. I bought the chrome smooth AC cover from HD and sent it out to be powder-coated in gloss black. Cost was $40 to do this. It's smaller in diameter than the Crossbones stock AC cover and retains the same look.........only better! It should fit well with the new Rinehart pipes.
I actually am in the process of doing exactly that. I have a 2010 Black Denim crossbones and am installing the black cross backs with black wrap. Because the whole pipe is black I am not installed the chrome heat shields and just wrapping where the heat shield would have been. I just finished wrapping them actually and need to wait for the wrap to dry (you soak them before hand) before I paint them. I am hoping they turn out well and fit the mainly flat black with gloss black trim style of the bike. I will hopefully have pictures tomorrow.