Wheel diameter and width are not the only issues when consicering wheel fitment. How many times have you seen a car with the wheels sticking out several inches beyond the fender? Ever wonder what that does to the suspension and steering geometry?
Blah blah blah...
Translation: We think you're too stupid to choose a rim on your own so to avoid legal worries, we don't list our rims at all without entering in your make and model. That way you can't sue us for being an idiot. Pissing off the 5% of our customers that want to search by rim is better than legal dealing with morons.
Cmon, at least be up front about it instead of pretending you're doing us a favor.