Hello, for your 21' Hyundai Santa Fe, the left side is # 87270S1000 and the right side is # 87280S1000. Please see the two links below for each side: https://www.carid.com/hyundai-oe/right-roof-luggage-carrier-side-rail-mpn-87280s1000.html https://www.carid.com/hyundai-oe/left-roof-luggage-carrier-side-rail-mpn-87270s1000.html