I appreciate all the help. Between the posts on the web and direct emails, I think I have what I need to at least begin to look around the local auto salvage yards. Apparently the key is that there is a turn signal/horn combination on it that is very rare (only offered one or two years on the Mustang II's, like 77 or 78). This should narrow it down considerably. It also has the hazard light switch on the left rear base, the tilt on the right rear, the key built into the right side, plus the little button you push to extract the key.
Thanks again. I will post again with an update.
