Fender mounted turn signals 1971 Dart/Demon

So I am looking at a 1971 Demon w/FMTS but there is no code L31 on the fender tag. Is this an option that would normally only be on the build sheet or should it be on the tag? There is no build sheet. The car does have the A46 exterior trim/molding group. Would it be part of that? I would assume not.
Thanks in advance for any help.