As you said, the eyelet that bolts to the inner fender has two wires: one goes to the quick disconnect for the EEC (the little black quick disconnect cylinder thing) and the other side goes to the little wire off your battery cable.
If you buy the correct negative battery cable, you should have a little wire off to the side - probably 10 gauge or so. It should have a butt-connecter on the end of it so you can connect it to your ground wire from the eyelet. You can splice them together w/ solder or a butt-connector if yours is gone.
Hope this helps.
Good Luck
