Hi again Dennis,
I didn't see a response back from my original question(s), but I believe you are looking for the "cradle" shown in the attached image.
You CAN find and order these directly from the Garmin website if you like, and I have a link to the exact page you need to visit to do that below.
BUT, you MAY want to order the entire "suction cup mount" from a different source (online), and be able to save a little money. I also have a link or two to Amazon, where you can get that suction cup mount - for about half of what the Garmin site quotes.
Nuvi 200 series suction cup mount (includes cradle).
Link to same item on Garmin site (~ twice the price)
Nuvi 255w Cradle (only)
Link to item on Garmin site (Called Bracket Mount ~$11 + shipping)
I hope this helps locate the part you need/want.
Please let me know what you find or if you have any more details or questions for me.
If this has answered your question(s), please take a moment to rate MY service level (Excellent is my goal) so that I get credit for helping you with this question.
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Thanks, ***** *****