Hi Nadeem,
I have just got a RAM holder for my 2610 to go on the bike, it was only a tenner, you could then get a suction cup and arm to go with it and Bobs ya Uncle.
IMO, the 3.25" twist lock suction can be said that "these little mothers suck !" but take into account the weight that will hang off it from the screen. If using a flex arm, then bend into a U shape so the base of the U kisses the dashboard.
I think every 26xx series GPSR ships with a small round base that can be attached to the dashboard with either of two sticky pads (permanant or temporary), and also with a beanbag mount for use in rental cars.
It doesn't appear to make sense to me to go buy an aftermarket mounting solution for a car - the small round base and sticky pads are dirt-cheap, and I think the beanbag mount is not much more than $25.
Personally - I use the sticky base in my Golf, and the beanbag mount in my other VW. Both work equally well, although the sticky base is the more secure of the two.
I wouldn't bother with the bean bag. I found that it tries to escape through the side window if you drive with "enthusiasm".
Far better to stick the sticky base in your own car and buy a RAM suction cup and arm system to take on holiday with you for the hire car.