Hi all - new to the forum. I purchased a 2000 323i Convertible as a project car. It is missing pretty much all of the closure panels under the engine area. I am confused about what panels I am missing. There is a "aggregate protective plate" (51717028893) which appears to be metal and an...

...that fasten the guard to the air dam at the front end. I think they are the plastic capture / quick release pin type. Does anyone have a part number and/or tip for where I can get these things? Here's a photo of the fastener in question: Hugh