lost 6 disc cartridge need help

i have a 97 cummins with the 6 disc changer under the backseat but i lost the cartridge for it to load the cds in does anyone know which cartridges will interchange with it? Also i wanted to know if i bought a different head unit like a kenwood or something that you can get changers for too if my stock one would work with it thanks any info is greatly appreciated

There were some companies that made interfaces for aftermarket CD changers into factory head units. Not sure if they went the other way. Check ebay.