I haven't seen one for an E-body.

But E-bodies have a large flat area between the shifter and console door. I've seen many woodgrain inserts stained from someone putting a drink there.

I think I've seen can holder that are weight and/or have straps on them. Maybe you could place one of the flat woodgrain of the console and have straps with velcro to hold it down so you can remove easy.

When I was driving across country in my 68 Barracuda, I unbolted the ashtray and hot glued a square plastic tupperware cup under the square opening. It fits a soda can with a koozie/can cooler.

The hot glue can be broken off the chrome and you can later re-bolt on the ash tray and sliding door assembly and not permanently alter anything.

With some more effort I could have left the sliding ash tray door on and you would never know it was a cup holder with the door closed.