Floyd Rose FRX. 

The Floyd Rose FRX system is a perfect fit on all Fatsos. This unit installs directly onto the instrument with zero body modifications.
The upgrade is completely convertible and can be reversed back to the fixed bridge configuration with little effort. The original bridge, tail piece and truss rod cover are shipped with your order. 
The locking nut mechanism is installed behind the nut so intonation remains untouched. The two chrome screws leave holes if the lock is removed, but when the original truss rod cover is reinstalled, they are completely hidden. 

$259.00 Installed