I recall seeing that the 1er mount and the 3er mount for the Nuvi differ. The 3er mount requires you screw 4 screws into the dash, where the 1er mount supposedly does not have that requirement. There's a thread on this site with the 3er installation instructions, showing how you screw into the dash in a location that if you remove the bracket, you'll have 4 holes staring at you, front and center.
There's no way in hell I'd screw 4 screws into the face of my dash for a mount...
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