nascar roof transponder or hockey puck vintage take off

Description

These transponders were used on the nascar roofs from mid 2000's  ,for how long ,I don't know . If you restoring your racer , these are the real deal . I have 10,000 parts , newer and older , have the newer style of transponders too !  If you are unsure were they located , look on the 2 cars in the pics.