Model A Back Cowl Mounting Screws

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Are the rear hood mounting screws secured with machine nuts? The screws go at a slight angle and terminate in a hard to reach area between the firewall and gas tank.

Are the nuts accessed by hand in-between the firewall and gas tank, or do the screws grip with what's in-between then firewall and gas tank?

Synder's catalog shows the rear hood mounting screws sold as a set of two on page A-163. Nuts are not depicted, leading me to believe nuts are not used.

Any ideas? Please Help!