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All 67,68,69 427/435's have a unique rear spindle. On a 68 or 69, it will have an "x" or an "o" stamped into the spindles. This is visible with wheel on the car and hubcap removed. if you post a picture or PM one to me I can tell you if the axles are original 435's. Remember that it could have had the orig spindles replaced at some point too.
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This is a shot of left rear spindle on my unrestored L71.