Are you looking specifically for Ceronix original part number, or just looking to replace some that are not working? There are several Ceronix manuals in the file system and every component has a Ceronix reference number. Ceronix no longer supports any CRT product. I have never seen color coded thumb adjusters other than on the remote board. There must be hundreds of those boards sitting in someone’s parts box somewhere. Lol
If you just want to replace one that doesn’t work, Digikey sells them in all shapes and sizes. Personally I bought an assortment box on Amazon and they work fine.