I have a pair of DEPO Cobra headlights in my car. They're *almost* as good quality as the original Ford ones, but the glue they use to mate the lens to the housing is kind of sub-par. Over time, it turns brown-ish and can stop holding as well. I can actually remove my passenger lens from the housing if I'm careful... I got mine so dirt-cheap it's not even funny, though.
Someday I might pull them apart and re-seal them with something a little higher quality. For now, they work fine and don't gather moisture inside so I'm happy. I do have to say they put out light a LOT better than the stock V6/GT headlights (even ones that aren't yellowed).
They're also the best looking headlights for an SN-95, IMHO.