PIO: The code “PIO” stands for Performance Image Option. In other words, if your Mustang has this code on the tag, it’s a true GT (Gran Turismo) model. GTA models were known for their enhanced performance features and sporty styling. So, congratulations on having a GTA?     

1967 Fastback Mustang it has a buck tag, which lists the equipment beyond what is on the data plate It clearly has “PIO” on the tag, which translates to “Performance Image Option (GT).” So, yes, this is a real GTA.     
If your Mustang Fastback has the GT&GTA package, it would be the PIO code stamped on the factory-in installed “buck tag.” THIS PARTICULAR GRAN TURING GT" ONCE IS REPAINTED IS WORTH OVER $80K ALMOST DOUBLE THEN BASIC REGULAR C CODE FASTBACK. THIS MUSTANG IT HAS THE BUCK PIO TAG CODE, THE PIO CODE IT WAS LIMITED EDITION OPTION, DO YOU OWN RESOURCE I ONLY FIND ONE FOR SALE IN GERMANY 1967 289 GT" WITH THE PIO TAG OPTION  ASK $85K EURO IS LIKE $95K AMERICA DOLLARS, HOWEVER MY ASK PRICE FOR THIS ONE IT SUPPOSED TO BE $50K AS IT IS, THE LOW PRICE THAT YOU SEE REFLECT BECAUSE I NEED TO LET GO! UP FOR SALE BEAUTIFUL GRAN TURISMO FASTBACK MUSTANG GT" PLUS FACTORY GTA" PLUS CODE A, PLUS BUCK TAG CODE PIO PERFORMANCE IMAGE OPITION, PLUS EXTERIOR GT GRUP, RARE TACHOMETER FOG LIGHTS REAR FOLDING SEAT CENTER CONSOLE MANUAL MIRROR, MATCH NUMBERS MUSTANG, HOWEVER THIS FASTBACK IT HAS MORE OPTIONS BUT NOT REMEMBER AT MOMENT. ALL THE ELECTRICAL SYSTEM ARE FUNCION NORMAL HEADLIGHTS ALL THE DASH GAUGES WIPERS HAZARD HEATER HORN TURN SIGNAL COURTESY LIGHT FOG LIGHTS BRAKE TAILLIGHTS. THE CHASSIS FRAME IS IN GOOD CONDITION IT NEEDS SOME BODY WORK ATTENTION HERE AND THERE, HOWEVER IF YOU HAVE A GARAGE NOT NECESSARILY TO FIX ANYTHING BIN LIKE THIS FOR THE LAST 25 YEARS SO ENJOY AS IT IS! RECENTLY REAR LEAF SPRING WAS REPLACED, FRONT AND REAR BRAKES, ALL THE SUSPENSION SHOKS, STEERING COMPONENT, EXHAUST, ENGINE AND TRANSMISSION SERVICE, THE CAR RUNS AND DRIVE EXCELLENT ALSO VERY STRONG AND VERY FAST MUSTANG!  THIS IS NOT A TRIBUTE; THIS IT IS REAL FACTORY GRAN TOURING GT"............IT ALSO IS VERY RARE PIO EDITION $50K FOR THIS CAR IS TOO CHEAP! NOTE.. NOTE.. NOTE.. I JUST DROP THE PRICE TODAY 6 / 25 DRAMMATICAL FROM $50K TO $38,500 BECAUSE IAM MOTIVATE TO SELL, IF YOU ARE LOCALLY AND WANT TO PICK UP IN PERSON AND DRIVE HOME PLEASE CALL 347 631 9496.