By "normal" do you mean stock? There are a huge variety of options. There are some decent pictures on the web if you google "pantera air filter pic". I made a buck to make my own center cover. The original one did not fit well at all. The curvature was way off compared to the side covers. On my '71 the only fasteners are on on the side of the center cover. The front has a lip that slides into a "V" shaped channel on the firewall. I believe that's how all the center covers were setup. Maybe the later cars changed this. BTW the "dog bone" intake has been dyno tested against more conventional air filters and has negligible effects on hp.
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