I have a GX 470 and a Toyota Land Cruiser. Both of the original key fobs/shells broke on my LC within the last year. I replaced them with these 3D printed shells, I found on another forum I follow for my Land Cruiser, and thought I would be proactive and get one for my Lexus as well. These are a great option if and when you have the same issue as many of us do with these shells breaking over time. I am in no way affiliated with this company, but do highly recommend these 3D printed key fobs!
http://yotamd.com/products/key_fob/index.html
