I have uploaded two files, NTSC_16x9_No_PanScan.mpg and NTSC_16x9_PanScan.mpg.
Unfortunately I don't yet have any MPEGs with the frame_centre_vertical_offset and frame_centre_horizontal_offset values set, but as soon as I have them, I can pass them on to you (if you need them).
NTSC_16x9_No_PanScan.mpg is 720 x 480 and has display_horizontal_size set to 720 in the sequence_display_extension.
NTSC_16x9_PanScan.mpg is also 720 x 480 but has display_horizontal_size set to 480 in the sequence_display_extension.
P.S.
I uploaded a little utility for viewing the MPEG fields, it needs .NET framework 1.1 to run.
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