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Using the seat belts read me file, I'm guessing we have to do this?

As root.
Copy the script to /etc/init.d
Change script mode to executable
Create this symbolic link using this command:

ln -s /etc/init.d/<Script Name> /etc/rc2.d/S80seatbelt"

Reboot

And

To reverse changes, remove the link and script...

So basically all we need to do is create a sym link to a script for it to run on start up?