Samsung ECS-K2 holder with gooseneck for Galaxy S3 (i9300) and smartphones with displays of 4 to 5.3 inches (Wireless Phone Accessory)
Customised has convinced me here, the variable setting. For since I will not have my S3 the next 10 years, so I have the opportunity, this holder to vary in width, so I then my future S4, S5, or whatever, can also be employed here. Perfect!