The Camper Special emblem for the year of the bed ('70-'72) would have been mounted on the cowl panel, just in front of each door. The emblems on the back would have either been Custom, Sport Custom, or Ranger. If the '70-'72 style Ranger emblem fits and there are a couple additional holes right next to it, they'd be for the additional 'XLT' emblem used for those trim level trucks.
Sounds like you're either going to have to weld up some holes and repaint, or just find the correct emblems that fit the holes and mount 'em, hoping nobody questions it.
![Wink ;)](./images/smilies/icon_wink.gif)