This was Ford’s goal for 1966 and close to 700,000 Mustangs were built in an extended model year. A new deluxe interior featuring the galloping pony seat inserts served to continue its popularity. Instead of a separate luxury model, Ford decided to offer a set of luxury options. These options were given the name ‘Interior Decor Group’. Most noticeable of these features was the galloping pony inserts on the seats. For this reason, the Interior Decor Group is often referred to as the ‘Pony’ interior. These special interiors were also known as Deluxe or Luxury interiors. Cars with the ‘Pony’ interior trim were sometimes called ‘Ponycars’ or ‘Pony Mustangs’. In 1966 Ford offered many styling ‘refinements’. The options/accessories in the 1966 Mustang totalled over 70 compared to 50 in 1964.