Stan, I've been searching for the same for a '57 GMC. I finally have a set. They would be the same on your Chevy.
I live in Gilbert and I see that you are in Phoenix. I don't think that the stops would be hard to fabricate if you had originals to make a pattern. You are welcome to use mine to trace a pattern, or to compare them to the ones that you bought to see if they can be adapted.
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Send me a PM if interested.
Matt
