I did one a few days ago for the 5th gen guys, and I wanted to show love to the 4th gen guys. It's a time consuming mod, but it really does look good IMO. However the 4th gen OEM knob does not look as massive as the 5th gen one to start with.
Here is a pic of the knob in my 4th gen (only pic i can find at the moment.
Here is a pic of the knob in my 4th gen (only pic i can find at the moment.