Hello, these are extensions, not cables that go from the connection to the power supply unit. Why 65cm, if you don't mind me asking?

Hello

They are not 65cm at all!
I haven't even paid attention to that - probably because I didn't need them that long.
Mine are 47cm from end to end plug - all of them.

But please note:
The cables are (incomprehensibly to me) packed/shipped folded twice (kinked) !!! If you want them nice and straight, you'll have to buy a more expensive set and hope that they're smarter about it.
Or stretch the cables and straighten them again - which can take time (especially in winter).
Hope this is of some use to you.

Greetings, Sacha

I want to assemble a PC on a movable shelf under the height-adjustable desk, and I would like to distribute the weight by moving the power supply away from it. For this reason I am looking for longer cables.
I think I've found them but they cost a bit.

Corsair Premium PSU Cables Pro-Kit Type 4