Welcome to MVS. I'm having trouble finding that trim piece for the washer. I tried "washer cap", "headlight washer" etc. Here's one of my failed searches https://www.volvopartswebstore.com/productSearch.aspx?ukey_make=865&modelYear=2010&ukey_model=11970&ukey_trimLevel...

For some reason Volvo North America calls it a Jack plug: https://www.volvocarstorontoparts.ca/p/Volvo_2010_C30-25l-5-cylinder-Turbo/Jack-Plug-Cover-Right--Front/42911321/39876479.html RHS is part #: 39876479 LHS is part #: 39876478 The parts come ready to paint. A good autobody show should be able ...