If you got the originals from Crestron, Crestron's a good bet. Xantech and Niles also have them, and probably others, too. LED shapes are not the same for all manufacturers, so get covers for the brand and model you carry. I say "model" because Xantech recently changed the shape and fancied up the name of their same old LEDs so they can charge more money and so you'll have to buy new covers. Mmm, more sales good!