Radium Engineering's replacement fuel bladder fits the RA-series 10.5 gallon spare-tire fuel cell and is supplied as the serviceable internal bladder. It is explicitly noted as a replacement for the RA-series 10.5 gal spare tire cell and includes SFI and FIA certification as part of the bladder assembly, making it suitable for compliant race or high-performance fuel cell repairs.
Radium Engineering R11A Replacement Fuel Bladder 10.5 Gal Spare Tire