In my black 5S I put in some rails when I got the car and used the hard nylon rollers from Byars. They work pretty good, but I think I would really prefer some type of harder rubber that has a little give to it. We all know those seat rails are not perfect flat, and so if you drive agressive you can rock a little back and forth/up and down since the hard rollers don't give any pressure/cushion. If hard rubber was in the rails I think it would give a little more support when the rails are not exact.
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