The most common replacement is the Replacement Cap for etrailer and Ram Swivel Marine Jacks part # MJ-1000B-CP this sounds identical to the description you have given. view full answer...
The Replacement Round Bars for Pro Series Complete RB Weight Distribution System part PS58440 are no longer available as they have been discontinued by the manufacturer. Therefore, your only option for replacement would be a new system. The Curt TruTrack Weight Distribution System part # C17499 would be a great upgrade option or for a simple cost effective replacement we have the Curt MV Weight Distribution System part # C17051. The TruTrack has sway control whereas the MV does not.
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