There is a service manual for 2004, which should be very close, on the Forum site. Do a search for service manuals. I found out that the wiring harness is different from the coupe to the roadster a month or so ago. The hole the bolt went through did not have any kind of groumet ? I would have thought it would have had one either made into the glass or one that goes around the bolt that you put on. I'm like you, thought the glass was the same on both.