Unfortunately, most customers who purchase this kit do not inform us which vehicle they put it in, so we can't advise on fitment most of the time. We have not had any reports of customers using this in a GX470.
You will need to evaluate your available space to determine whether you can install this kit. The base of the tray is 14.25 inch by 10.75 inch, and it is 10.5 inch tall up to the top of the isolator.