1968 440 GTS Darts (Only 6 Built)

How did they get the OK from NHRA to build 6 Ringer cars?

NHRA said they had to have at least 6

here's all 6 I found

The original '6' factory 1968 GTS 440 Darts (SS/EA).
1) Dick Landy (California)
2) Saddleback Dodge (Charlie Allen) (California)
3) Friedman Motors (Des Moines, Iowa)
4) Greater Detroit Dodge Dealers (Ron Mancini)
5) Rockville Center Dodge (Rockville Center, L.I., New York)
6) Bob Banning Dodge (Hyattsville, Maryland)