iMac (Late 2013) & 5.1 Speakers?

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I have an iMac (21.5-inch, Late 2013) and some old Logitech z5500 speakers.

What's the best way to connect them? I was on Amazon but the Toshlink cable I was looking at says they're only compatible with iMacs dating from 2014.

Can someone give me advice. This is the back of the speaker controllers.

 

[jerwin]

they've got that the other way around. Apple removed the jack in 2015. If you've got a machine made before that, (and you do)you're golden.

 

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Ah cheers, will order that cable immediately. Thanks. I actually bought these speakers ten years ago and ashamed to say due to moving house and getting work done have never plugged them in until now.