Mazda RX-8 Workshop Manual page 3541

NOTE:
If the rear window glass is tilted while inserting the pin into the body, the sealant will rub against the body flange,
causing damage to the sealant.Do not tilt the rear window glass to the left or right while working.
10. Press the pins and engage the tabs to the body.
11. Press the rear window glass at (a) shown in the figure from the rear of the vehicle so that the measurement of the rear window
molding lip gap is within specification.
CAUTION:
If any sealant adheres to the AM/FM antenna and/or filament, be sure to wipe it off.
12. Install the nut.