Thanks for the assistance!
The individual clips are created in After Effects 6 and their somposition settings are:
HDTV 1080 25
1920 x 1080
25FPS
square pixels
7.9MB per 8bpc frame
They are exported as:
Format: Quicktime
Channel: RGB
Depth: Millions of Colors
Color: Premultiplied (Matted)
In FCP, the project settings are:
HD (1080 x 10820) (19:9)
Field Dom: Upper (Odd)
Quicktime Video Setings
Compressor: DVCPRO HD 1080i50
Audio Settings
Rate: 48kHz
Depth 16 bit
Config Channel Grouped