Pontiac 1999 Firebird - Manual (Page 119)

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1. When installing the panels to the roof, keep the
outboard edge of the panel raised about three inches
(8 cm) above the roof while placing the inboard edge
of the panel under the center roof.
2. After the inboard edge of the panel is in position under
the center roof rail, lower the outboard edge of the
panel into position, close the latch and lock the T
- top.