SPAD VII 150hp service dates: Start 09/1916, End~11/1917 or 15 months (OFF plane)
SPAD VII 180hp service dates: Start 04/1917, End~06/1918 or 15 months
SPAD XIII 200hp service dates: Start 05/1917, End~04/1918 or 12 months
SPAD XIII 220hp service dates: Start 02/1918, End 11/1918 or 10 months
SPAD XIII 235hp service dates: Start 08/1918, End 11/1918 or 4 months (OFF plane)
The SPAD VII 180hp was used as long (15 months) as the SPAD VII 150hp, so it is just as important.
The SPAD XIII 200hp was used for 12 months (longer than either the 220hp or 235hp), but it was the one with the most engine problems so tends to be forgotten.
The SPAD XIII 220hp was used far longer (10 months) than the OFF portrayed SPAD XIII 235hp (4 months).
This is why I asked if these important SPADs will be added to OFF since it only takes a FM change to the existing models versus creating new planes from scratch.