This is the replacements inner sides, right or left air plates for many of the Vermont Castings wood stoves but may fit other manufacturers and models based on size and shape

Left, Part # 130-0637 or Part # 1300637
Measurements: 19" x 11-3/4"

Right, Part # 130-0636 or Part # 1300636
Measurements: 19-1/4" x 12"