Specifically what I need is the plastic coil cover that sits next to the washer fluid reservoir on 86-93 Mustangs. The previous owner of my car said broke so he took it off. I'd like to replace it so the engine compartment will be complete but I don't know where to search for part numbers.

I am not familiar with the part you are asking about, but have you checked out wrecking yards yet.

I am not familiar with the part you are asking about, but have you checked out wrecking yards yet.

No, mainly because there aren't many good ones around here, plus I wanted to find one in nice condition since the rest of the car is in great shape. I did figure out that the part is called a coil shield though and I found a site that has brand new ones for $20.