what are these called and where can I find them

they aren't sill plates for sure , they are called carpet hold down molding or trim. They hide the wires and hold the carpeting in place. While these are called Sill plates, Scuff plate or threshold plates. I make replacement sill plates (custom or the boring stock shaped ones) and may be cnc'ing a master for those carpet hold down plates if I can ever get some of my other stuff done..

!!!!!!sill plates made.jpg

!!!212SILL PLATES.jpg

20230108_143311.jpg