I found myself having to replace the rotary encoder on the radio headunit, but in doing so, I did not notice that the new encoder has a thicker shaft and does not fit the original knob. My curiosity got the better of me and I pulled the knob for the A/C and lo and behold, it's the correct size for the new rotary encoder in the radio head-unit.

Does anyone happen to know a part number for the A/C knob OR have a spare one available you'd be willing to part with?