We just got some black cord, cut it to length, and made our own. pretty simple depending on your racks. Just make sure you take into account how much the old bungee stretches and the new bungee stretches.
Got polyurethane cords from here. They don't stretch as much as the rubber ones, so factor that in when buying (and cutting to the right length). Got them in dark blue which matches the boat too.
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