Cargo cover for 06 GX470?

[SloweGX]

I recent bought friends 2006 GX470, with the third row seats. They said they didn’t have the cargo cover. However, after much investigation, I found out no cargo cover for GX with 3rd row seats. I have taken the 3rd row out and would rather have a cover so I can leave golf clubs in back under cover.
Has anyone had one put in?  I have heard GX470, similar/same as Toyota Land cruiser. Does any one know if LC parts can be used in GX? If so, what model LC? Looking for cargo covers, LC covers seems to be more available on second market  Or should I contact Lexus?

Any info much appreciated

Sarah