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For the male threaded parts I'd recommend something like 4140HT or 4340HT but the turnbuckles can be plain mild steel like 1018 or 1020. Heat treating will help, but not important on the female parts, but don't bother if you make aluminum turnbuckles.
These days you can buy many of the components off the shelf at your nearest offroad fab shop or major online vendor like summit, look around.
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