These fit handlebars to one inch and fits the round mounting attachment on the back of your GPS. These include a rubber strip for smaller handlebars too.
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Buy Motorcycle / Bike Handlebar Mount for TomTom One 125 130 130S 140 140S Ease XL 325S 325SE 330 330S 335S 340 340S [...]

Brand New AC Adapter / Charger for TomTom GPS Navigation Systems. It is compatible with TomTom XL Series 325 / 325s / 330 / 330s / 340 / 340s / TomTom XXL Series 530s / 540s / TomTom One Series 125 / 130 / 130s / 140 / 140s / One / One [...]

100% Brand new, comes with cleaning cloth. Match screen shape and cover the whole glass screen, not just the image area. Easy to install: no cutting needed, self-adhering surface Leaves no sticky residue after removed
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Buy Pre-cut to fit, no cutting is required. Premium Clear LCD Screen Protector for Tomtom [...]

Brand new plug in car charger for TomTom GPS Navigation Systems. It is compatible with TomTom XL Series 325 / 325s / 330 / 330s / 340 / 340s / TomTom One Series 125 / 130 / 130s / 140 / 140s / One / One 2nd Edition / One 3rd Edition / [...]

ext-to-Speech for Spoken Street Names. Street names and traffic info announced by your device, so you can focus on the road ahead.
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Buy TomTom XL 340S Refurb Unit at Amazon

No description for this product could be found, but have a look over at Amazon for reviews and other information.
Buy TomTom 4.3″ Portable GPS Bundle - 340S at Amazon

Superior protection at a very reasonable price is our hardcover GPS case. These were custom designed by a GPS fanatic. The interior is fitted with elastic straps to keep your GPS in place. The other side has a pouch for stowing other stuff like a power cable, SD cards or MountGuys business cards [...]

TomTom XL 340-S LIVE is navigation and so much more. Real-time information saves you time, money, and stress. GO LIVE automatically accesses traffic feeds, updated fuel prices, Local Search powered by Google, and Weather–so you can stay in the know on the go. Real-time services work right out of the box via a [...]

The TomTom XL 340-S is complete navigation in a widescreen device. Switch on and go right out of the box. Spoken turn-by-turn instructions, including street names, will guide you to any address in the United States, Canada, and Mexico–including more than 7 million preloaded points of interest. [...]