Many of Fender Pure Vintage hardware and bridges are crafted where possible on the same tooling and machinery as our original-era Fender parts. Some of this original tooling has been diligently rebuilt to achieve the crisp clean construction of original vintage Fender products, though many Pure Vintage parts still retrofit several of our modern instruments and amplifiers. Whether you are personalizing, modifying or restoring, there is no better way to maintain the proud heritage and period-correct accuracy of your classic Fender instrument or amp. Pure Vintage "Piggyback" Bushings . Set of two chrome-plated bushings used to mount "piggyback"-style amplifier heads to amplfier cabinets. Internally threaded to accept piggyback thumbscrews (sold separately). Introduced on Blonde and Blackfaceâ„¢-era amplifiers Used on Tone Master® 212, Super-Sonic„¢ 212 and Super-Sonic 60 speaker enclosures.