Yes. The '66 battery tray is different from later models. Its the same basic size as the later one (and replacement ones from the supply houses), and will mount on the battery supports just like the original. The '66 one has less holes in the bottom and the easiest way to differentiate in the later one is the tabs that the hold-down rods hook in. The '66 tabs are square down to the formed edge of the tray. One the later tray (and the Repop), the tabs have a long slope down to the formed edge. I'll get a picture...It's worth many words..
Your battery tray is a '66, but I'm not sure about the reinforcement piece on the right side. I have never seen that before. It appears to be original too..