Factory Five Racing GTM Supercar Assembly Manual page 643

Set the firewall in place as you did during the trial fit of the body.
Drill and rivet through the Firewall, the body, and then the "L" Flange of the Upper Wheel Well panel.
Install the cowl bracing side panels.
Press the weather stripping on the top edge of the panels. At the ends of the Firewall where the firewall
touches the body, remove the rubber coated clips leaving the weatherstrip bulb to continue to the corner of
the firewall.
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