Well. Anyway the M91E is what I have and it fits. Oh, Stanton's DJ cartridges fit as well. You see, somebody permanently modified the headshell, and to get the the stylus "on the money" with minimum tracking error, it's got to be backed 'way into that tiny headshell with the connectors folded over. "Solhaga" on ebay (in Denmark) has an original headshell/cartridge for only $1595.00! Expensive, and, I think, mono. Nothing else about this GS-5D has been permanently modified. Maybe I'll sell it, I don't know, until I get an idea of its true value. Right now, it's playing through a recently repaired (took forever) Sansui AU-6600 with two sets of KLH speakers.