If you have always had a hankering for a Touratech GPS mount for that older model GPS, go to the Touratech website and check out their sale items. You might find their mount for your model now being discontinued and on sale.
I'm still using a Garmin StreetPilot (I have 3 2730s and 3 2610s), and I have one Touratech mount. I just ordered two more of this discontinued model for a LOT less than the regular price. That will allow me to continue using a nice lockable and cushioned mount without having to constantly swap it from bike to bike.