I made a metal plate for my dash that has 2 USB ports on it, using cables very much like in your picture, but taken from a PCI slot card faceplate.
I used the PCI faceplate as a template and drew the rectangle holes, then used a dremel tool to make the openings. The first one I did looked like crap but I learned how to slow down and move more carefully. The second one came out pretty good, although not perfect, but good enough for me. I used a flat file to square out the corners since they were rounded from the dremel metal cutting bit.