Need help identifying a part I need for my front valence/bumper
 

I recently acquire a stock Carrera valence for my 1985 Targa so I can replace the one the previous owner put on (way too low). I noticed, while trying to size up the new valence, that I needed some panels to go behind the bumper bellows. I marked the piece that is missing in the first picture and what I believe it is in the second picture. Anyone know what this part is called or its number?

http://forums.pelicanparts.com/uploa...1465700951.jpg
http://forums.pelicanparts.com/uploa...1465700975.jpg

That is a front apron. 911 503 315 00 Left and 911 503 316 00 Right.
You can download the Porsche Parts Catalog for free at Porsche Classic Genuine Parts Catalogue - Porsche AG