They are all flat. and they all have the inner holes for a spoiler. The ribbed are for 72 - 76. Call me at 610-533-9917. The price depends on the condition of what we find. I know there are some in the race car trailers and some on cars that are here. $50 to $200 depending on the condition bring cash. All parts are usable and in good condition kept inside. You can call me at 610-533-9917 Steve
