Here's one on ebay, the only difference between it and mine is that mine says "74 and 80 Twin Models." Same items, diagrams, etc. on the same pages and the price ain't bad.
Rich
http://www.ebay.com/itm/VINTAGE-HARL...-/301088542673
Rich
http://www.ebay.com/itm/VINTAGE-HARL...-/301088542673
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