This is a little hard to describe, but take a look at the plastic "spikes" sticking out of the inside of the light assembly. When you re-attach the bulb carrier, this spike should fit into a hole in the bulb carrier. This may be where your problem is.
When the piece is manufactured, there are actually two spikes, and then one of them gets snipped off at the factory. (Take a look at your stock light and you'll see what I mean---right near the spike, you'll see where another spike was snipped off.) Now, compare your stock light to your new one. My guess is that the wrong spike was snipped off, and the remaining spike is not going into the hole. If so, just snip off the remaining spike, and you're all set. This was a problem with my OEM '02 sedan clears, and I know a bunch of other people who ran into the same problem. Never heard of this on an earlier year model, but your problem sounds exactly the same.
Hope this helps.
When the piece is manufactured, there are actually two spikes, and then one of them gets snipped off at the factory. (Take a look at your stock light and you'll see what I mean---right near the spike, you'll see where another spike was snipped off.) Now, compare your stock light to your new one. My guess is that the wrong spike was snipped off, and the remaining spike is not going into the hole. If so, just snip off the remaining spike, and you're all set. This was a problem with my OEM '02 sedan clears, and I know a bunch of other people who ran into the same problem. Never heard of this on an earlier year model, but your problem sounds exactly the same.
Hope this helps.