Question about Lian-Li O11DMINI-1X-3

Hi all I need a riser cable PCIe 4.0 and not 3.0 where can I find the cable. The other retrofit kit is not on order / available. https://www.digitec.ch/de/s1/product/lian-li-o11dmini-1x-4-vertical-gpu-bracket-kit-20-cm-datenkabel-intern-pc-15983842