As Domique wrote earlier I would not risk a try with the Seasonic. Doing so, you may burn the PSU, the GPU and then everything...
I bought this one for the Corsair RMX 850W, and they work pretty well with it.
For Seasonic, I'm guessibg you'd better have to check this out:
Seasonic Gen 5 12VHPWR 90° cable wh WAPH16883AW

I wouldn't risk it. In the worst case, the wrong cables can short-circuit the PC.

The wiring of the pins on the power supply side varies depending on the manufacturer, as no standard applies here. The standard only applies to the component side.

Therefore, only use cables that are explicitly made for your power supply. Alternatively, cable extensions can be used as these are universal.