I have plenty of useful spare parts for the Jeeps I own. Two sheds and the attic of my shop.Since you own a G body you will just to have the needed spares & back up parts. I opened my museum in '90 & still adding to it, using as I need to.
I don't keep the useless ones. They go in the trash.
But I am aware I will have to find some G body stuff if I plan to keep the car forever.