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rubber inside Pulsation damper on toyota fuel rail

Hi i have a toyota pick up thats leaking fuel from the pulsation damper on the front of the fuel rail ive found pictures of what this thing looks like inside just a spring and a round piece of rubber sandwhich between round pieces of metal ..i am trying figure out what type of rubber that is maybe tire rubber or rubber gloves  maybe  someone here has rebuilt one  hope you guys can help 

Picture of rubber inside Pulsation damper on toyota fuel rail
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