Comments below ... the standard breaker with no options should work ... it might be best to remove the breaker and take it to an electrical supply, they should be able to find an equivalent match to your existing breaker.
Partno. QO120GFI -- Base GFI Breaker, No Options
Mini CB - QO - 20A - 1P - 120V - 10kA - Plug-in - GFI
Partno. QO120GFI35 -- Higher temp rating
Mini CB - QO - 20A - 1P - 120V - 10kA - Plug-in - GFI - 50Deg
Partno. QO120GFIBCP -- Commercial Packaging
Mini CB - QO - 20A - 1P - 120V - 10kA - Plug-in - GFI - CP
Partno. QO120GFICP -- Commerical Packaging
Mini CB - QO - 20A - 1P - 120V - 10kA - Plug-in - GFI - CP
Partno. QO120GFISP -- Short Pigtail
Mini CB - QO - 20A - 1P - 120V - 10kA - Plug-in - GFI
Partno. QO120VHGFI 22kA breaker
Mini CB - QO - 20A - 1P - 120V - 22kA - Plug-in - GFI
