You certain it's a Bonneville? Star Chiefs were entirely separate models, and I don't believe Bonnies were made in two-door posts in '59.
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'67 GTO Hardtop Montreaux Blue 400/400
'67 GTO Hardtop Regimental Red/Black Cordova top/400/4-speed
'67 Bonneville Ragtop Montego Cream 400/400
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