Thanks much for this. Knowing you also have a 92Excella I hope that you won't have a similar experiences to mine. If I'm remembering correctly you took care of some front end separation several years ago, which I believe is at the heart of my issues.
Who ever originally installed our wrap protectors did not bother to install the upper middle hold back either. It may not have been considered necessary at that time. Anyway, now I'm getting ready to install patches in this area on both of my front quarter panels to cover the severe gouges caused by the top of the stainless rock guards rubbing on the upper front area of the each QP.
I also have a lot of shell damage caused by what must have been a history of the stainless rock guards hinges pulling loose from the shell requiring multiple repairs and multiple holes. There was also some bad damage where the upper curbside back was installed. The installation of my hold backs was literally upside down from that recommended in the diagram. As I said the upper mid point hold backs were not installed ever. It appears, the problems from that installation were further exasperated by what must have been ferocious front end vibration.
Fortunately, I'm in a great position to make everything right. With no inside skin to cause interference I'm able to patch and properly reinforce everything properly.