Where to Buy Bendable Riser Cable

I'm planning to build a PC using the LZMod LS-360 V2 case. The issue I'm having is find a good riser cable. The riser cable need to go behind the power supply, and do a 90 degree bend/fold, then an 180 degree bend to connect to the GPU.

The seller ran out of cables and I have to find riser cables elsewhere, but I don't know where to look. The shape of the riser cable will also be an issue, since most riser cable on the market are "not recommended to bend" by my research.

The case is still in shipping, and when it arrives I'll measure the required length then. For now, any suggestions can point me any sellers is approximated.