Just bought a new radiator from Rock Auto. I think it was like 3 clicks to drill down to the part. I just tried your method and was blown away. After I entered the year and make, and was halfway into typing the model, it autocompleted all the way to my trim level and I resumed typing "radia" where it suggested all the relevant things. Hitting enter, I watched it navigate the tree on the left.
Small delights like that are worth serious money.
I love sites that have such a structured categorization of their items. McMaster-Carr is the gold standard IMO, and RockAuto is pretty close.