Most of the aftermarket ones I have dealt with need a fair amount of fitting to look correctly centered in the grille shell opening. I have had one set fit fairly decently, but having installed 4-5 sets of these, I have had to grind down the locating pin on the rear, hog out the mounting holes and spend an hour a set with the grille in and out a few times to make them fit correctly.
Projectors can be fantastic... however most of the eBay crap is just that. Great White has a set in his truck, but he removed the stock bits ( bake the headlight in an oven to take it apart ) and replaced them with Acura projectors and a set of HID's.
In any case, if your reflectors aren't too badly pitted / wrinkled and the lenses are clear, you would be better off to adjust them properly ( if they still adjust that is.... ) and polish the lenses, buy new bulbs and a harness kit to get full voltage to them, rather than plop in a set of aftermarket lights.
Most of the aftermarket lights 'look' good from the outside, but the pattern is not as good as a clean stock headlight.