Arkon Seat Rail Or Floor Car Mount For Iphone X 8 7 6S Plus 8 7 6S Galaxy S8 S7 Galaxy Note 8 5 Retail Black

What is the difference between this model and the arkon’s rv188 roadvise premium universal car seat rail mount?

What is the minimum width of the holder? i want to make sure my phone can fit as it's smaller. iphone 5s. with case it is just over 2.5" wide.

Is the gooseneck a solid aluminum rod or an actual gooseneck like those used for microphones?

What size of ball is used? I'd like to use the gooseneck with my own phone holder that has wireless charging built in.