Acme 1:18 Scale 1968 Shelby GT500 KR - WT Color Code 5107 - WT #6. In 1968 six special paint colors appeared on Shelbys. They were known by their special "WT" identification code number. The total production number of these special “WT” paint cars was just 159 across all six paint variations. These cars were sold as part of Ford's "Summer Sales Promotion". The “WT” cars were offered on both the GT500KR and GT350 models and were only available with black or saddle interiors. The rarity of these cars is increased because they could not be ordered from Shelby. To get your hands on one of these cars, your Shelby dealer had to track down the “WT” car you were after throughout the Shelby dealer network.