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You don't say what scale you are looking for. Assuming it's HO, a few minutes on Google turned up some possibilities. I have not used any of these products or made any purchases from these vendors, so I can't vouch for any of them.
I have a number of vintage Athearn metal stanchions, new in packages looking for a home. Theses are from the old days the eighties when I was painting shells a dozen at a time.