Fits most vintage and modern Fender amplifiers. Set of two 6.3V direct replacement pilot light bulbs for amplfier power indication. Originally introduced on '50s-era Fender amplifiers. Used on Hot Rod Deluxe, Hot Rod DeVille, Blues Deluxe, Blues DeVille, Blues Junior, Pro Junior, Custom Vibrolux Reverb, Super-Sonic series, Vintage Modified series, Vintage Reissue series, '57 Twin, '57 Deluxe, '59 Bassman, '94 Twin, Vibrasonic, '57 Bandmaster, Vibro-King and Tremolux amplifiers. • MSKU 0021642049 • UPC 717669612092