Bump for answers also. I was gunna ask the same question...
The only seat cowl ive seen for the 08' is from the yamaha GYTR line of parts which is like $240...I did see a solid blue one, but it was for an 07' (08' is different i assume)
ide like to also know if anyone makes nice solid replacements befor i shell out the cash for the factory yamaha one which has the back pad thing on it