Wow, some of you guys can be quick off the draw on some people...makes me even a bit gun-shy to reply here but...
The OP, a female (pertinent), posted some information about how she got the car she got and what she was told she would get. Apparently, they weren't the same thing, and like most dealers I've ever dealt with, one has to wonder if she was mislead on purpose or through stupidity on behalf of the sales staff. Either way, it's their mistake, not hers. And while I realize the dealership is "going to make it right" by retro-fitting a spoiler of choice, I can't help but wonder if she wasn't taken advantage of because she is a female (happens ALL the time).
Whether you agree or not, the OP had certain preferences about the car she wanted and whether or not you agree with them, the spoiler was one of the main reasons for plopping down the extra money. She didn't get it because of an honest mistake or direct lying. I would be irritated if that sort of thing was done to me as well.
So, AK posted some photos (photos ALWAYS good)
and there was some other good advice about a spoiler on a roadster...
. But some of the other replies...