Here is the rubber cap with built in hose clamp from the plumbing store:
This image shows the plastic pipe cap as well, I painted it black...
The odd shaped hole in the footwell is where put in the piece of sheetmetal. I used the plastic trim as a template and used the original screws. Painted that black as well. If you want an additional pic of that let me know. Total cost of the three items was under $5.