The MMC2 is near top of the line. See related products below for cheaper solutions for your Beogram.
B & Os proprietary cartridge mounting system does indeed obligate you to use their cartridge solutions but that is a good for your ears (if not your wallet).
This wonderful cartridge will work in any of the following Bang & Olufsen models:
BeoCenter:220070077700BeoGramRXRX2TXTX218002000240430003300350045005000500555006002650070008002850090009500