My (formerly...luckily) 79 924 had no passenger side mirror. My 66 FJ40 doesn't either. In TX, this is legal, since you only are required to have 1 rear-facing mirror to pass safety inspection. In some states, there are no safety inspections at all. It would probably be "legal" in those states as well.
For the heritage crowd, Google image shows plenty of old Elans without passenger side mirrors.