Seat rebuild question

Finally getting around to doing my son's seats for his '67 Dart. I need some supplies, but not sure if these wires were necessary (they don't come in the Legendary installation kit). They are spaced about an inch apart in the burlap of both the seat bottom and back. They break if you try to open up and end to remove them from the old burlap.

I watched the Legendary video on installing covers for a '69 Charger, but I don't know if those had these wires or not.

Second pic the new cover. I figure this is going to take me a couple of weeks, at least...
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