Once the boot lid is fitted, latched and closed, the rear end section can be trail fitted, screws and washers can be used to temporarily fix the kit as shown:
The rear body section can be lifted by the spoiler to align the edges of the boot lid with the surrounding shuts:
Once you are happy with the fit of the panels the temporary screws can be removed, tiger seal used to bond on panels and screws replaced until tiger seal has cured then removed and replaced with countersunk pop rivets.