How many 2008 Tjaarda mustang 350R were made?
There's no such thing as a "2008 Tjaarda Mustang 350R". Carroll Shelby's modifications to Mustangs, and other performance packages, were offered in various years but never involved a model specifically called a "Tjaarda Mustang 350R" in 2008 or any other year. The name "Tjaarda" is associated with automotive design, but not with a specific Shelby Mustang model.