Package Of Two Genuine Fender #47 6.3V Vintage Amplifier Pilot Light Bulbs. Bayonet base. Real Genuine Fender factory parts. Fits your old or reissue amp. Bayonet base with two pins; line up the pins with the two slots in your pilot light assembly, then push down and twist clockwise to install, push down and turn counterclockwise to remove (believe it or not, a number of folks have asked me about this-there's a 'how many guitar players does it take to change a lightbulb' joke in here somewhere...). Yes, these will fit your '50s-'70s vintage Twin Amp, Twin Reverb, Showman, Bassman, Pro Reverb, Super Reverb, Bandmaster, Champ, Vibro Champ, Deluxe, Vibrolux, Tremolux, Harvard, Princeton etc. exactly. Also fits many other vintage amps by Silvertone, Supro, Oahu, Airline, Danelectro, Ampeg, Gibson etc. Brand New. Genuine Fender 0021642049. UPC 717669612092. Photo does not reflect current Fender packaging.