Welcome to LQ!
Why do you need the original sources.list for Sarge? Are you having problems - tell us and we might be able to solve them.
Anyway, my sources.list on my Sarge box has the following lines, which are unchanged from when I set the box up. Obviously, the "wa.au" refers to my local mirror, so you should find one closer to you.
Code:
deb http://ftp.wa.au.debian.org/debian/ stable main
deb-src http://ftp.wa.au.debian.org/debian/ stable main
deb http://security.debian.org/ stable/updates main contrib
I hope this helps
--Ian