Same here, peel off the one on the head light assembly and make sure the new lamp already has one, a little dielectric grease on the gaskets works nice too

 

I noticed the same issue with my 09. one bulb fits tighter on one side than the other. i actually had to install a thin rubber washer behind the bulb gasket to get it to fight tight enough.

 

Rk Smith, you were right. I had tried every replacement bulb imaginable, the last one I got was the PIIA. $100 for the pair. They didn't fit either. That same day I read your post about the gaskets sticking. I looked down in there and sure enough the old gaskets had stuck. The PIIA lights went right in then. These lights are awesome too. So bright. I had to call back all the companies that I had complained to about their bulbs not fitting an H3. lol. Thank you again.