This is a great enlarger for 35mm. You can use any normal lens, but will require to refocus when you change image size. The most common original lens is the 40mm Focotar. You see these for sale, but they can be expensive. I don't use the autofocus feature on mine, although I have the correct lens. If the lamp holder is missing, I would suggest contacting the Leica distributor for your area. They may be able to supply the parts, and most likely at a competitive price. The lamps are available from various sources. There is some useful info online, and in the archives of this forum, which may help you. Alex