non-assembly parts in BOM

I have 3 very simple parts detailed on a single drawing. While they are not part of an assembly per se, they are used together.

I would like these 3 parts to show up in a single BOM, but as you know, when placing a BOM it asks for you to pick a single part/assembly. Thus, only one part shows up in the BOM. I could manually add a couple more rows and type in the information, but that will not auto-update.

I could place 3 different BOMs in the drawing, but that looks pretty cheesy.

Is there some way to get a BOM to include parts that are not in its currently shown assembly (or part)?

Thanks

SolidworksBill Of Materials