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I assume you weren't lucky enough to find it listed among the few 1970 Cougar convertibles we have in the database so far...
http://www.imcdb.org/vehicles.php?resultsStyle=asImages&yearFrom=1970&yearTo=197- 0&makeMatch=2&make=mercury&modelMatch=0&model=cougar&modelInclModel=on&modelInclChassis=- on&modelInclExtra=on&class3=3&origin=&madein=&madefor=&role=