Look for the word "PIAA" on them. That's the best indicator of quality I've ever seen. I bought a couple sets of those cheap "projector" jobs from the local autoparts store. Both were crap and lasted less than a year each. I got a set of 1500XT in the "fog" (wide beam). I liked them so much I bought a second set of the "driving" (narrow beam). Yes, I have two sets mounted on the front of my '97 Explorer LTD. Cut some square aluminum stock (believe it was 1 1/8") and bolted it between the two bumper support brackets. Two lights are positioned in the stock bumper cutouts where the originals were, and the other two on the aluminum bar I added. All four are behind the lower bumper fascia so they look like an integral part of the bumper.
I no longer care about the crummy headlights. When I need to see, I definitely can see. And these have lasted 3 years or so, I think (and are still working like new).
This link may be pretty slow, but will show you the finished product:
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