I have no idea where Ricky Bobby found this cause he sent me the link and I can't get it to come up on my own either but here it is BMW E53 X5 N62 4.8L Search 54137118849 ES#157541 Sunroof Cable Repair - 54137118849

That is for the main and then the cheaper one that you linked is the rear. . .or so i am told. It does make sense when you look at them.