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Hi I will be glad to help you. Here is a good place to look. http://RepairClinic.com Just input you model number and find you part. But under that model number I get these hinge parts http://www.repairclinic.com/Shop-For-Parts/a4b1c71d514902/Model-SBDE20S4SW-Amana-Refrigerator-Hinge-Parts
I hope the information I gave you is helpful in finding what you need.
Upon further search I have found that specific part "No longer available". This means you may find only miscellaneous appliance parts stores that might still carry them. The following link says it is still available https://www.appliancepartscompany.com/product/11204591 please paste the link into your web browser.