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One error, one missed opportunity ;)

1) They are BUSS bars, not BUST bars

2) Instead of replacing them, there's an amazingly cheap/simple way to clean copper:
- Pour some vinegar into a small bowl and add some plain salt. Don't need a lot.
- Dump in the buss bars, wait five minutes.
- While waiting, make a paste of baking soda plus a little water
- Remove the buss bars from the vinegar, wipe briefly with the baking soda paste, rinse and dry.
DONE!

You'll be amazed how easy and how well this works.
(FWIW: the baking soda neutralizes the acid in the vinegar to stop the reaction.)