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Two cord-and-tassel rings can share the same listed outside diameter without being the same replacement part. For these FORTISVEX options, the first distinction is the intended pole material: Z050484 is listed for wood poles, while Z050485 is listed for aluminum poles. Both have a listed outside ring diameter of 15/16 inch. If you are replacing a missing ring, start with the pole and its existing attachment, not just the size of the circular opening. The outside ring measurement describes the ri …