Just wanted to share the RAM mount setup I chose for my Garmin Vista HCx GPS unit.

I hope it proves useful to someone...

RAM parts used:
1. Base with 9mm hole and 1" ball (part nr. RAM-B-272U)
2. Socket arm with octagon socket (part nr. RAP-B-200-1U)
3. Diamond base with octagon button (part nr. RAP-272)
4. Holder Garmin (part nr. RAM-HOL-GA16U)

I also used a hex M5X20 bolt (a in the photo, found in the local hardware store), to replace the OEM M5X12, and a washer.

Bolt torque according to service manual: 5,2 Nm