Any RF's available, other than GY & FR for 05 C6 Z51?

[CA C6 Fan]

Having peroused all the usual suspects (Tire Rack, et al), it seems that only GoodYear and Firestone are the only manufacturers that make RF's for my 05 C6 Z51 Corvette? The numerous inputs from numerous tire dealers in my area tell me the FR's are basically "junk" and not to purchase them for my vehicle. So, I'm only left with the GY's. Can anyone shed some light on this? I sure would like a much larger selection than this. My C6 tires are fine (at 27K miles) but I will need new tires at some point in the next year or so. I had heard some rumors about Michelin eventually making RF tires that fit the C6 Z51? Any others hear this? Thanks, in advance, to all. Paul