Paint code “Unknown at this time “

https://www.autocolorlibrary.com/pages/1973-Plymouth.html
The first letter tells you the year the color was first used.... J is 1973

D = 1968
E = 1969
F = 1970
G = 1971
H = 1972 I is not used
J = 1973

Second letter is the basic color

F = Green
B = Blue
Y = Yellow
X = Black

The third letter is shade

1 is very light
3 is medium light is medium
5 is medium
7 is medium dark
9 is super dark IE TX9 is black