Whiteline rear differential mounts for the Scion FRS and Subaru BRZ is the perfect way to stiffen up the soft rear bushings. Fix annoying differential movement and noises whilst ensuring appropriate differential pinion angles for maximizing power transfer to the wheels. Whiteline rear differential mounts for the Scion FRS and Subaru BRZ is the perfect way to stiffen up the soft rear bushings. Fix annoying differential movement and noises whilst ensuring appropriate differential pinion angles for maximizing power transfer to the wheels.