Thanks again ngcreese. Based upon your response I made a leap of faith and got the part. The clip doesn't go on to the ball as-is, so I'll dremel the ball notch away like you had to.

This will definitely provide for a clean secure mount.

I haven't decided if I will connect the mini USB to the back of the radio as the intructions call for. I am not sure if I can even do that - I installed an IPOD adapter last year, so there may be a comptability issue - haven't gotten that far.

Hardwiring to a fuse like most of you have done is probably a cleaner option.