Here's a link to the custom cupholders in my 59 gmc.
cup holderI spent a few days tinkering around at a machine shop. Although not terribly pretty, the cup holders are invisible when not in use, and no holes were put in the truck to install the holders.
I can get anything in there from a standard Coke can to a Super big gulp and everything in between. I wanted at the very least to be able to hold a cup of coffee and the "trucker's restroom" gatorade bottles.