Gold plated, removable bridging bars

Hello group. I purchased a set of RTi70 speakers, but I am missing a Gold plated, removable bridging bar on one of them. I have spent sometime but have come empty trying to find one. Can somebody tell me the actual Polk name or Polk part # and where to find one. I am OK if there is a generic replacement. I have temporarily solved the issue by putting a piece of speaker cable. I would think that speaker value is somewhat lowered by having the wire instead of the bridging bar or am I mistaken?
Thanks

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