Wow...good catch on that.
I was about to upgrade to hog tunes and will have to check the size of my Zumo 665 antenna to be sure I can fit it in the space. I use the sat weather and radio daily so it would be a problem if I loose that feature.
The antenna looks the same size at the one shown (For Garmin 550)..... Mike does not have the mounting tabs but uses sticky 3M tape.
Thanks for posting