Fender Piggyback Clip Bars. Set of two chrome-plated clip bars used to mount "piggyback"-style amplifier heads to amplifier cabinets. Includes all mounting hardware, including tee nuts, ribbon springs and mounting screws. Introduced on Blonde and Black panel era amplifiers. Used on Tone-Master® 212, Super-Sonic™ 212 and Super-Sonic 60 speaker enclosures Brand New. Genuine Fender 0990721000. UPC 717669505752.