SKU Description: FLEX-8000 Series Radio GPSDO Upgrade (Factory Installation Only) If you initially purchased your FLEX-8000 series radio without the GPS Disciplined Oscillator (GPSDO) module and have already received your radio, this SKU is required to...

This GPSDO is compatible only with FLEX-8000 series radios.  It is not compatible with FLEX-6000 series radios. This module is factory installable only, it cannot be installed in the field.