I heard about a model of Ford Mustangs that were part panel wagon called the special delivery. If they do exist, how many did they make and what years were they available?

Ford never offered a Mustang station wagon. To solve this problem, different people and companies have created their own Mustang wagons with mixed success. The factory Ford Mustang wagon is a fabled creation. The story goes that in 1966 Italian coach builder Intermeccanica built a Mustang station wagon for advertiser Barney Clark and designer Bob Cumberford which showed up in many car magazines of the day. Supposedly Ford had a Mustang wagon in design stages around the same time but scrapped the program shortly after the Intermeccania cars appeared. The Intermeccania cars are often mistaken for a factory concept.

Conversion.

Custom 1965 Ford Mustang Station Wagon built by Joe Kamp.

By using a clean, original Mustang Hardtop as the foundation, the wagon body was created with 100-percent steel and uses as many factory components as possible. The original roof was cut, lengthened, slightly widened, and installed with sections of the original C-pillars out back. From there, the rear tailgate and window were made using the original hardtop pieces and deck lid.