Pontiac 2002 Firebird - Manual (Page 127)

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NOTICE:
Do not attempt to install the panels by sliding
them horizontally toward the center roof rail.
Doing so may cause the weatherstrips to be
aligned improperly, which may result in leaks
and possible damage to the weatherstrips.
NOTICE:
High pressure car washes may cause water to
enter your vehicle. Never spray water directly
at the roof panel joints. This will cause leaks.