Mp3 codec for mpeg2 format?

Hello, do you think you can advise: I am using After Effects CS3. I need to produce a video - the requirements are as follows:
IT MUST BE AN MPEG2 FILE, FOLLOWING THESE  SPECS:
MPEG2 (2:2:0)
• Window Size: 720x480
• Frame Rate: 30 FPS (other  frame rates will severely affect quality and not recommended)
• Video  Bitrate: 8 Mbps video constant bitrate.
• Video Codec: MPEG Layer 2
•   Audio Bitrate: 320 kbps audio
• Audio Codec: MP3 (44kHz stereo)
•  Multiplexed (Muxed)
but when I want to render my project - there is no such option "mp3 audiocodec" for MPEG2 format. Am I missing something?
Also - even though my composition is set to 720 x 480 and I am renderig it using the same settings - when I play it in Windows Media PLayer - it is displayed at different dimensions (640 x 480). What am I supposed to modify to comply with the above requirements (720x480)?
Any help is appreciated!
Thank you.

Mylenium, THANK YOU for your answer. Well the thing is - we do not intend to put the video on DVD. Instead - they will produce FLV file of it AND (because we're talking about video for the online press release) according to them:
IF YOU WOULD LIKE YOUR VIDEO  AVAILABLE FOR MEDIA DOWNLOAD, IT MUST BE AN MPEG2 FILE,
FOLLOWING THESE  SPECS:
MPEG2 (2:2:0)
• Window Size: 720x480
• Frame Rate: 30 FPS (other  frame rates will severely affect quality and not recommended)
• Video  Bitrate: 8 Mbps video constant bitrate.
• Video Codec: MPEG Layer 2
•   Audio Bitrate: 320 kbps audio
• Audio Codec: MP3 (44kHz stereo)
•  Multiplexed (Muxed)
(sorry for repeating the same info).
Does this make more sense to you now? Is it even possible to "multiplex" mp3 to mpeg2 format? There is good chance the video will not even have audio (but then AE produces m2v file) - but in case it will?
Thank you again for your time!

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