From HERE?
Brief tutorial on Ford Part Numbers:
D5ZE ...
D= Decade, C= 60's, D= 70's, E= 80's, and so on
5= year in decade, C5 would be '65, D5 = 75 , E5= 85, and so on.
Z = Model Line. Z is for Mustang. T= Truck, W is Cougar, sometimes those change, far as I know Z has always...