They want to sell a different special edition for MY22. And they are bringing at least one new paint option, so one or more MY21 colors will go away.
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The Mustangs all had 1965 Vin numbers. No 64 Vin numbers !Through the 80s, 90s and into the new century, the printing company I work for printed "authorized reprint" Ford Shop Manuals covering Mustang, Falcon, Fairlane, Cougar, Montego and T-Bird from years 1965 thru 1973. Thick books. And even though we only printed it once, there was a 1964 1/2 shop manual. Much fewer pages just to get service personnel started. Maybe some remember them being sold at rod runs or swap meets. The Mustang was a game changer. Every manufacturer had to create a "pony" car. The Bronco did the same. And now is again.
Edit. It was a stand alone supplement and also included with 1964 Comet Falcon shop manual