OP UPDATE: This Is a great trunk cover for your FX if your model did not come with one. An it's just $72 and only 15 minutes to install.
After trying several other cargo cover widths, I found this one fit almost perfect in my 2004 Infiniti FX45.
COMPLAINT/PROBLEM: A lot of older FX models did not come with a factor trunk cover (aka Tonneau Cover) and in my 2004 FX the side plastic walls did not come "cut-outs" or hardware to hold the recoiling cover crossbar.
The solution for me was to buy this trunk cover on Amazon designed to fit a Rear Trunk Cargo Cover Compatible for Grand Cherokee 2011-2021.
They call it a “Retractable Rear Trunk Cover Security Shade Shield” and it only costs $72. Here’s the website link:
https://www.amazon.com/dp/B07KTX2DH4?ps ... ct_details
Installation is easy. Just adjust the 3 headrest straps, but not too tight. This is to give the cover enough “slack”so you cover you trunk contents without much tension in the cover.
The "cover real" just sits on the side window shelf nicely. (NO hardware needed.) ...And then you just pull the cover towards the floor mat handle... add a shower “S-hook" to hold the cover in place... and now all your trunk items are hidden from view.
Note: I also drilled a small hole in the plastic cover "hook-n-place-tab" and added a twist tie to make a small loop. And with this loop I can hook and hold the cover in place by utilizing the Infiniti trunk hooks already in place. This leaves the cover laying nicely flat, but you can see about 8” of trunk space that is not covered in this position. …Still, you might want to leave the cover in this position most of the time, because it’s not that often your trunk is will to the max. At least my trunk is not kept that full.
PICTURES: Go to this website: https://www.infinitifx.org/threads/need ... unk.37559/