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I doubt that anyone can legally give you copies of those files. In general, if you can't read a backup tape, you reload the os to get to a point where you can read the backup tape. Do you have your installation cd's?
A short cut that sometimes works... Boot the installion cd into single user mode, mount the root disk, and copy the one or two files that you need. If you have a lot of commands that still work, maybe you can reverse the process... mount the cd and copy a few files off of it unto your root disk.