Jim,

With a little patience you can go to the Prevost Car site, and through the maintenance section access parts listings. You can also gain access to serial number specific maintenance manuals also.

It is doubtful you can download an engineering drawing of the part, but it might show an assembly to give you an idea of its methods of attachment and how it is assembled.

The easy way might be to drop it off, and if all that is wrong is some bent sheet metal, remove the metal part and either have a local shop duplicate it, or if the rubber part isn't very floppy, just leave it without the sheet metal (that is likely just decorative). Actually it would be unnoticed most of the time if it wasn't for the fact that the stainless stands out.