1969 Ford Mustang Boss 429. The mustang is an iconic muscle car but one of the most important and well-respected variants of the mustang was the 429 boss. in captain69 1969 Ford Mustang Boss 429. The mustang is an iconic muscle car but one of the most important and well-respected variants of the mustang was the 429 boss. in In 1969 the Shelby American Mustangs were all made in-house by Ford. The Shelby GT500 Cobra Jet were quite different specs to the other Mustangs in their range. The Ford Mustang 1969 has 22 variants. The length 4760mm, the height 1303mm and the width 1811mm. What are the standard Ford Mustang 1969