use to lose them all the time in my 98...there were two sizes, only differing by a very small amount..cant remember why there were two sizes, but untill i figured that out, I was losing the smaller one all the time...havent lost one in the Z yet.
I was driving down the interstate (I- 81) one night and this big black thing flew up and hit the windshield. I asked the wife "did you see that big ass bug ?). The next day I found the plug was missing from the left headlight, and knew it wasn't a bug after all.
I now haveto order one too. Thanks for the part number guys.