Early 66 Cuda/ Valiant badging in 1966

pishta said
Aw man! I was stoked to find my SO number was 0001 with an April 1 build date for a '65 S. 5540100001 is the number on the rad support. Maybe its the 1st down the line on April 1?

Nope, just the number that was on the order form (maybe the first order form printed...).