65 Valiant vinyl top?

No, it was not a dealer option — it was factory equipment. The partial vinyl roof was available in black or white. Find mention of it in the '65 Canadian Valiant brochure, which you can see the relevant page of here—this is the French-language version. The second-to-last sentence on the page Vous verrez aussi le chic toit recouvert de vinyl blanc ou noir des modèles hardtop translates "You will also see the chic roof, covered with white or black vinyl on the hardtop models".