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You have to be concerned about fake parts, too. Swap meet vendors, fleabay sellers and even some reliable outfits have sold junk with a fancy label.
If you are unhappy with the parts call the seller and ask for a refund or replacement.
Not a bad idea to buy parts from the manufacturer. You get a good deal from Crower here and you can't beat their quality.
I deal directly with a few outfits and their prices are good and they can steer you to the correct parts that will work instead of guessing when ordering online or thru a catalog.