Help Van de Hul MM-2 wiring question

Hello all,
Please Help!
I just acquired a Van den Hul MM-2 cartridge. I need help with the wiring please. Can someone please tell me which color leads go to which pins?
The pins are labeled as follows:
Top left - L Top right - O

Bottom left - R Bottom right - O

I apologize for my ignorance, but every other cartridge I've used had color coded bands on each pin.
Thanks for your help in advance!