The one I bought from ebay for my BMW for $39.95 was of "good" quality, considering the low price I paid for it. But, although it was marketed specifically for the model, supposedly, I found when I got it that it was really a "generic" type, but it did fit well, so I think all they do is have 8 or 10 different sizes and depending on the car model, they send one for that size car.
The only way you're going to get one custom fitted to your car (IMHO) is to fork over a couple of hundred dollars to one of the parts companies (e.g. PY, etc)
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PhilGoat 
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