What are "Counterpart" parts?

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I'd like to add a comment. I'd gotten a horn button retainer from classic parts out of Kansas City along with a lot of other items as part of a restoration of my 52 Chevy Pickup. I opened the horn button retainer about 8 to 10 weeks after I received my order. The horn button retainer had a broken clip. This happens. Classic Parts told me they basically have a 30 warranty and I was basically SOL. I called Counterpart Automotive in California and they honored their part and sent me a new one that next afternoon.