Menards, probably any big box store. They are all the rage--they are EVERYWHERE.

I don’t think those with the rectangular back are available every where and without knowing what size they are hard to help. BTW I sure hope you are not putting 2 on a drawer. Pewter , you could probably go stainless so maybe widen the search for that.

Other colors are listed as available https://www.wayfair.com/home-improvement/pdp/myoh-beaulieu-3-34-center-to-center-cupbin-pull-wpmh1294.html?piid=34439697