I wanted a phone holder for my classic VW Beetle but couldnt find one I liked. I found a holder here https://www.printables.com/model/322690-car-phone-holder and ashtray mount here https://www.thingiverse.com/thing:5233847 . (Much appreciation to their work!) This modification is for years of Beetle where the ashtray doesn't have a knob. The modified ashtray mount has hooks for the ashtray and is beefed up from the original. The back of the phone holder is flattened to get the ball reciever glued to it. Don't use PLA unless you live somewhere that it never gets hot.