doesn't matter.
You can fill in the OPT-based EAD A#, but chances are, a new A# will be assigned for you anyway. If your old EAD was c-9 based, or you had GC before, you should use the same A#.
You can fill in the OPT-based EAD A#, but chances are, a new A# will be assigned for you anyway. If your old EAD was c-9 based, or you had GC before, you should use the same A#.