I have some old but still usefull calibration and verification kits with A suffix and the foam is seriously degraded. Forme some models B and C I use, I was able to buy the foam parts from Keysight but I am puzzled by reproducing the various and strange holes in the foam. Any idea ? Is anybody selling new parts ? Thank you
Also, the holes could be for options (extra adapters, etc) that were not purchased at the time. Or for floppy disks!