"Any customer can have a Model T painted any color that he wants so long as it is *****"

 The Ford Model T came in a variety of colors, but the number of colors available changed over the course of its production run. In the early years, from 1908 to 1913, the Model T was available in gray, green, blue, and red. In 1912, all cars were being painted midnight blue with black fenders.

In 1914, Ford famously announced that "Any customer can have a car painted any color that he wants so long as it is black." This was because Ford had found that black paint was the most durable and least expensive to produce. As a result, the Model T was only available in black from 1914 to 1925.

After 1925, Ford began to offer the Model T in a wider range of colors again, including blue, green, and maroon. However, black remained the most popular color choice for Model T buyers.

So, to answer your question, the Ford Model T came in a variety of colors over the course of its production run, but the number of colors available changed over time.