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Here are a couple of models for you , just click the links below to see and buy ;
This one with free shipping ; http://www.shopjimmy.com/universal-tilting-wall-mount-for-32-65-flat-screen-tvs-free-shipping-to-lower-48-states.htm
And this one ; https://www.amazon.com/VideoSecu-Bracket-Samsung-600x400mm-MF608B/dp/B001TIG36C/ref=sr_1_1?s=electronics&ie=UTF8&qid=1501607358&sr=1-1&keywords=tv+wall+mount+tilt+frame
Either ones will do for a 55" tv
If that answers your questions for now then PLEASE DO TAKE THE TIME TO RATE (stars above and submit), it does not close this post , you can come back at any time without additional charges if you have further questions or need help and it gets this independent tech. paid for his time helping you .