4 Door Ford Mustang prototype.

Since this is "Mustang Week", I thought this was interesting.
A 4 door Mustang prototype from the 60's.

Also interesting, Ford was still thinking of a 4 door car based Mustang as late as 2008.

I wonder if they will use the new "2015 Mustang" platform for a RWD sedan.
Seems that Lincoln could  use something like that...