Don I really like your icons of Spad S.51 and S.61. So I made some investigation and paint some icons based on yours
Bleriot SPAD S.51 in all variants and engine slighty modified. Also Avia and Nakaima build this aircraft on license
-Spanish Republic
-Turkish
-Japan build by Nakaima
-French
-Soviet (only used in trials)
-Czechslovakia with square national symbols used in between 1920-1930 manufactured by Avia
-Polish
-Spain Nationalists (after war started)
-China
-Spain Republicans (also before war)
Bleriot SPAD S.61 straight wings and water-cooled engine only used by Poland and Romania
Bleriot SPAD S.81 only used by France
Bleriot SPAD S.91 used by France and Spain (Republicans after start of civil war)