RS is an exterior package. Deluxe interiors could be ordered on any model, SS, RS, Z/28, none of the above. Since you mention that your car should have the deluxe interior, I assume you decoded your trim tag. If it says deluxe, then it is a deluxe interior regardless as to it being an RS (which is also on the trim tag...). BUT make sure you order/get the correct rear seat covers. I'm pretty sure the rear seats for '67 deluxe interiors are narrow and have arm rests (I have a '68 which doesn't have narrow deluxe rear seats. So, I know '68s better).