Originally Posted by smassey321
The second mount was one I recently ordered. My guess is the first mount is the first version of the kit form a few years ago. Reading the instructions for the first version of the mount you were required to screw the bracket into the face of the dash! I was glad that I can remove mine without any permanent damage.
The part number I used is this one
Smassey is correct, one is the early version and the other is the revised version. The early version requires some changes which can not be easily reversed.