They were once available online from Lava World but all has changed now. The top caps came in colors and some are even plastic for the 32z line. Early versions had the screw on caps with inner rubber washers they are very hard to find. What I use to do if a cap was needed was buy a cheap 32z or 52z lamp when on sale just for the cap which came in silver and painted it as needed I now had an extra cord with on/off switch and a base to be used whenever plus an extra globe to be custom done. What size are you looking for?