gps brackets from touratech
the lockable one locks the gps into the cradle so you need a key to get it out, the other just has a spring loaded arm that holds the gps in. dont waste the extra cash, you should never leave the gps alone on the bike whether locked or otherwise and some bastard will have a go with a big screwdriver, and the lock just makes it a pain in the arse every time you stop.
the touratech cradles have rubber shock absorbers but the 60c is a tough little thing, look at RAM mounts and garmins own cradle.
they have a mount wizard which you tell your bike make and gps model and it tells you what you need from their (massive) inventory, they also do made up kits for the more popular combos.