Mt 84 Delta 88 coupe has been eating these clips like candy!! Several different brands. I have sprayed the weather strip with silicon with no joy. The clip attaches at the top rear of the window. Any one have any sugestions?

hole they clip in

 

I just had to replace that clip on my 1985 Delta. I used Dorman. The quality is crap. The clip wouldn't snap together properly. I finally got it in place and it's been working correctly for a couple of months now. Knock on wood.