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That I don't know. But, I think that I would prefer the formed stuff. It would probably make a better fit if it was formed specifically for our vehicles.
You can usually find the channels for the older vehicles for a decent price at car shows. We were going to get a stick (I think 8 ft) for $20 for the bronco but I didn't want to carry it around so its on this years list of things to get.
I do hear that there's a trick in bending it to fit but I don't know what it is.