Hello & Welcome to Just Answer,
May I ask:
1) the FULL MAKE & MODEL of your device?
2) Can you CONFIRM what accessory you are looking for (just need to verify)?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
If I'm correct, I believe you are looking for the "mount" - that attaches the device to the windscreen. If that is correct, I believe your best bet is to look for one on eBay or other online shop. I have a link to an eBay search below that should get you started.
Click here --> http://www.ebay.com.au/bhp/tom-tom-mount
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)