Logitech Z523 speakers with x530 subwoover connection

[Snoud]

Hi everyone 🙂

I bought some speakers today at a thrift shop but my stupid a$$ didn't know that the combination doesn't exist that way. I bought logitech z523 speakers and a logitech x530 subwoover.
The problem is, the speakers cable looks like a vga cable to me and doesn't work with the subwoover because it got less pins.
Any idea how I get that connected?

Thanks very much for your answers in advance, I appreciate your time investment. 🙂

Snoud