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I don't know where you can find them, but I do know what you are talking about. When you remove the brass oar lock bracket, there is a plastic sleeve embedded in the gel coat under the brass fitting. I removed mine and both were cracked. I plan on gluing them to seal the crack and replace them as they are not seen when the boat is finished. I will continue to watch this post to see if someone has a source to purchase new, but i doubt it. Good luck on your project.