1970-76 Duster Demon Duck-tail Spoiler

I bought one of those off ebay, the pics. are alot nicer than they actually are or at least the one they sent me!
Wavey and the fit is horrible! I emailed them and they said if i want a replacement i have to pay for shipping there and back for a new one, i thought about it but i'll probably just get another one like they already sent me.