This Listing is for one (1) ORIGINAL Leviton Mounting block for the # 476 End Cap, which are required to hold the Lumiline bulb on the Collins 312A-1 Speaker and 312A-2 Console. They are also found in Vintage AM/FM Transmitters display cabinets, jukebox, or other vintage fixtures.The Leviton mount for the end caps were discontinued long ago and they've been generally unavailable for years till Now! These Leviton LumiLine end cap mounts are found on the afore mentioned speaker and consoles and are made to accept the deep design end cap, with the C-shaped external contact, found on the #476 end capsThese Mounts are UL approved!I have a very limited supply of these mounts so do not hesitate to order them. It is always nice to have a spare mount or end cap in case you need one! The last photo above shows the end cap mounted on the receiver block. the end cap is not included. I do have them listed in another listing if you need only a replacement end cap.