Ferrari California Workshop Manual page 1323

Check that the step between the Tonneau Cover
and the rear screen, in the relative area,
measures (X), with a tolerance of ± 1.5 mm.
Check that the gap between the Tonneau Cover
and the rear screen is 4.0 ± 0.75 mm.
Check that the gap between the Front Roof shell
and the rear screen is 6.0 + 2.0/-1.0 mm.