Oregon 73-016 Paddle Set that Replaces MTD 731-0782, 731-0781, 731-0780, 721-0287 and 753-0613 Oregon 73-016 Fits 21-inch Snow Wolf Rectangles measure 1-1/2-inch by 3-3/8-inch with 2 mounting holes on 2-inch centers Crescents measures 1-1/2-inch by 11-1/4-inch Use with our 73-017 scraper bar