2009 Spec-D Tuning Mazda RX-8 Interior accessories for cars can be any number of objects, but they’re often either highly functional or completely rider comfort-based. For example, heated seating pads are more for rider comfort, while brand new gauge display lighting makes it much easier to see the readouts being given. It doesn’t matter if your upgrade is more comfort-based or entirely for functional purposes. Whatever type it is, just make sure it fits (after all, there is limited interior space to use).