Think most people see them as a little too big.
I was thinking along the lines of a Leon Cupra spoiler. I saw a pic of one on a 172 posted on here (ages ago) and thought it looked great. The other bonus is you can get then on ebay for very little money, £20 give or take a few quid if I remember rightly. (obviously a little modification will be required).
p reg i think. mite even have been a laguna (but the one with no holes in) very easy to fit and is very flexible so takes kerb abuse......
here you go
£5 of my hard earnt pounds. leaving me a brand new cup one under my bed to fit if i want to sell it................