im going to assume yes, the FRS/BRZ has a wheelbase of 101 inches, which is about 8.5ft, with the front and rear bumper say 10-11 ft
that car cover is good for a car that is 13.4ft
yes it will fit
im rocking a car cover meant for a BMW 328I and it works no problem
as long as it covers the entire car you are good
