This may not be the definitive answer, but when I look into the various Opel FSM's for different years, I see the following colours offered (but some may have been GT, Manta, 1900 or Kadett only, or some but not others):
1969:
BB Sand Beige
CC Sun Yellow
DD Regal Gold
HH Strato Blue
JJ Rallye Red
PP Spring Green
RR Brilliant White
UU Metallic Silver
I5 GT Metallic Green
I don't have a '70 FSM
1971:
PP Astro Silver
FF Glacier Blue
DD Strato Blue
CC Alpine White
HH Jade Green
YY Chrome Yellow
XX Fire Glow
RR Flame Red
GG Aztec Gold
TT Antique Bronze
1972:
FF Glacier Blue
DD Strato Blue
CC Alpine White
HH Jade Mist
YY Chrome Yellow
XX Fire Glow
RR Flame Red
QQ Rallye Gold
TT Antique Bronze
The 1973 FSM specifies which paint for which model:
C Alpine White: 51,53, 54, 57, 57R, 77
D Strato Blue: 51,53, 54, 57, 57R, 77
F Glacier Blue: 51,53, 54, 57, 57R
H Jade Mist: 51,53, 54, 57, 57R, 77
Q Rallye Gold: 51,53, 54, 57, 57R, 77
R Flame Red: 51,53, 54, 57, 57R, 77
T Antique Bronze: 51,53, 54, 57, 57R
X Fire Glow: 51,53, 54, 57, 57R, 77
Y Chrome Yellow: 51,53, 54, 57, 57R, 77
M Deep Burgundy: 57L
B Regency Blue: 57L
S Grecian Silver: 57L
And for Vinyl Tops in 1973:
Black: 57, 57L (coordinated w/ exterior colour), 57R
Burgundy: 57L (coordinated w/ exterior colour)
Dark Blue: 57L (coordinated w/ exterior colour)
1974:
GG Signal Green: 54, 57, 57R
CC Polar White: 54, 57, 57R
DD Strato Blue: 57L
FF Signal Blue: 54, 57, 57R
HH Jade Mist: 54, 57, 57R
QQ Rallye Gold: 54, 57, 57R
RR Flame Red: 54, 57, 57R
TT Antique Bronze: 54, 57, 57R
XX Fire Glow: 54, 57, 57R
YY Signal Yellow: 54, 57, 57R
MM Deep Burgundy: 57L
BB Regency Blue: 57L
SS Grecian Silver: 57L
And for Vinyl Tops in 1974:
Maroon: 57L
Dark Blue: 57L
Silver-Gray: 57L
Black: 57, 57R
1975 (all models: 51, 54, 57):
CC Polar White
FF Signal Blue
HH Jade Mist
QQ Rallye Gold
RR Flame Red
SS Grecian Silver
TT Antique Bronze
XX Fire Glow
YY Signal Yellow
and the vinyl top was in black only, and only on the 57
HTH