Pontiac 1999 Firebird - Manual (Page 118)

yellow blue
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2. Push the handle closed to secure the panel in the slot.
To lock each panel in the storage area, use your
door key.
Installing the Twin Lift-Off Roof Panels
CAUTION:
An improperly attached roof panel may fall into
or fly off the vehicle. You or others could be
injured. After installing the roof panel, always
check that it is firmly attached by pushing up on
the underside of the panel. Check now and then
to be sure the roof panel is firmly in place.
Reverse the steps to install the T - top panels.