Hello Jamie
You can use any MMC20 (S/E/EN/CL), SP15 and the older MMCxxxx (3000/4000/5000/6000). Be aware that there is a slight chance of some units to have age-related problems like hardening of the suspension inside.
There is also the possibility of getting your cartridge retipped by Axel Schürholz at http://schallplattennadeln.de/
He will replace the suspension an stylus with new components and make your cartrigde sound like a new one.
Cheers,
Søren
Beocenter 9300, Beogam CD50, Beocord 5500, Beomaster 3400, Beomaster 4400, 2 Beogram 4000, Beomaster 8000, 2 beogram 8002, Beovox S-75, Beovox MS150.2, Beovox RL6000, Beovox S-35, Beomaster 6000, 2 Beocord 9000, Beocord 8004, Beocord 5000, Form 1, 2x Beolink 1000, Beo4, MX3500, LS4500. Born 1993.