If you open the Adobe Media Encoder in PPro (File > Export), then you should be able to choose a preset. Choose MPEG2-DVD for your format, then select Video in the left pane and choose “NTSC DV High Quality 7 Mbps CBR 1 pass” preset, change aspect ratio to 16:9, then change the bitrate from 7 to 8 via direct entry (click in the field, then type “8”, without quotes). Make sure Multiplexing is set to None, then click OK to export.
That should do it.