Firewire to Thunderbolt Cable/Adapter

Does anyone know of a solution to my issue?

I have an older G-RAID with firewire 400/800 ports. Which worked great on my iMac 2007 which did have a firewire port.

But, lucky me, I upgraded to an iMac 2017. And of course, it only has thunderbolt ports.

Regards,
jr7138

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