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The ends of the leads are threaded. I didn't realize this when I purchased it and my magneto has swaged ends on it, which are not compatible with the threaded ends. ACS would not accept the return as it is considered a custom order, even though it is a standard magneto harness for an IO-540 engine. My loss, your gain as I am selling for $100 off the price I paid for it on 11/29/25.