In the "DIY Beolab 8000 Wood frets (STLs included)." several people have been asking for frets for Beolab 6000 and I decided to give it a try.
Attached is the fret needed. 4 is needed for each speaker and they will fit nicely in the grooves for the normal cover.
The grooves are for 5mm wood, and there are 10 grooves i.e. 10 length of wood is needed plus two on the sides for each speaker.
The attached file has to be renamed to stl - it is not a pdf.
See below the fret mounted on the BL6000



