quest for an alternator fan

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Clockwise from top: Hitachi alternator, original Lucas (flat) alternator fan, Hitachi (indented fan)
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Hitachi fan. Not enough room for the grooved belt pulley.
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Lucas fan: too large in diameter, so the mounting bolt is unreachable.
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Ta da! A Volkswagen fan fits perfect. Right diameter, and correct depth, more than enough room for the big pulley.
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making sure the spacer fits right in the middle with some JB Weld.
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With the pulley installed.
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Side view
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Another view.