I bought a linkup gen 4 riser on amazon and it’s perfect for the MKII which is what I am running on my X570 board.

https://smallformfactor.net/forum/threads/giveaway-linkup-ultra-pcie4-0-riser-cable-the-true-gen4-designed-for-gen4.12307/page-2

https://www.amazon.com/dp/B0898R6LPY/ref=cm_sw_r_cp_api_i_nyivFbDH0RPWT

The developer of the cable confirmed the length and it fit perfectly when I switched over.

I learned about this cable from this post.

https://www.google.com/amp/s/amp.reddit.com/r/Louqe/comments/flvbax/fyi_confirmed_pcie_40_riser_developed_for_ghost/

It’s not the official cable from loque but a solid recommendation with warranty on the cable if it doesn’t perform.