Fox Two tone clear coat

Ford did not start using production clearcoat paints on the Mustang until the 1990 model year, and still then not all of the production colors were C/C every year. Even some 1993 paints were still single stage.

1990 = 4 non-C/C (EH, EP, YC, YO), 7 C/C
1991 = 4 non-C/C (EM, EP, YC, YO), 8 C/C
1992 = 4 non-C/C (EM, EP, EY, YO), 9 C/C
1993 = 3 non-C/C (EP, EY, WB), 10 C/C

There were four lower 'titanium accent treatment' paint codes used on the Mustang from 1987 through 1993.
1987-88 = 73
1989 = 76
1990-93 = YJ
part of 1991 = ZH