Hi J. There is a thread on it on the 6th generation Mustang forum. (Not sure if we are allowed to post links from there.)
Ok cool I just found it. My local dealer offered me a 350R if I can find an allocation. I was recommended to join there to help try and find one. -J
They called me on a 500 mile '17 regular GT350 they took in from a guy that is buying a '18 GT350. My friend just bought their '17 350R and I asked if selling an R could help them get an '18 R allocation. He said they don't have one, but if I could help them find an '18 R allocation they'd sell to me for MSRP. Long to no shot, but we will see. -J