The pedicle screw extension system may include a removable cannulated extension provided to a pedicle screw tulip head. The assembly includes first and second U-shaped fastener assemblies, first and second flanges configured for connection to the vehicle axle, a mounting pad and a suspension component such as a leaf spring or a leading or trailing arm disposed between the first and second flanges and mounting pad. A pixel matrix circuit and logic circuitry are formed on the active matrix substrate. A locking ring surrounds the tool holder body and in a locked position holds the locking body in a radially inward position in which the locking body engages the groove in the tool and in a release position allows the locking body to move into a radially outward position so that a tool can be inserted into or removed from the tool holder body. The subchannels need not be contiguous in the spectrum or belong to the same channel.