Replacement instructions and hardware is included to install the thicker paddles and the scraper. Genuine Toro parts assure proper fit and maintain consistent performance. All items included in this kit are packaged exclusively for use with the models listed below. Fits specific 21 Inch Toro Power Clear 621, 721 and 821 Series Snowblower models. Verify your five digit model number from the list below to assure correct scraper. Fits models Insight Snowthower (Models 34001 and 34002), Power Clear 621 Snowthrower (Models 38451, 38452, 38453, 38454, 38458, 38459), CCR 6053 R Quick Clear Snowthrower (38563, 38564, 38567, 38568, 38569, 38571, 38575, 38576, 38577), Power Clear Snowthrower 721 38578, 38581, 38582, 38583, 38584, 38585, 38586, 38587, 38588, 38589, 38593, 38741, 38742, 38743, 38744, 38751, 38752, 38753, 38754, 38755, 38756, Power Clear 821 QZE Snowthrower (38757).