Phoenix makes a number of customizable marker strips for terminal blocks in the CLIPLINE SK series, in particular the 0825122 part number, https://www.digikey.com/short/z079p7.
Thankfully Phoenix provides a great guide building these custom orders, we have the attached PDF below available for download. You will then need to download another piece of software from Phoenix but not to worry, they portray these steps quite clear and straight forward in the guide.
Custom marker help.pdf (1.4 MB)
