They probably were a option... Since every 4dr starts as a base model, dealers likely ordered the bright rails to spiffy up the selections he had on lot... A customer order may well have passed them over...... You need a option list to really know, could well have been std one year, optional the next... In the late '60s & early '70s Ford published a buyer's guide or Armchair Estimator so you could figure prices at home on a new model... Looking on ebay newest I've seen is for 1973... http://www.ebay.com/itm/1973-Februa...ash=item3f8372a460:g:iWoAAOSw-itXuhjg&vxp=mtr