This part is commonly Used on models:
78491 Bagger, 200 Series Z Master
78490 Bagger, 100 Series Z Master
78506 DFS Vac Collection System, 500 Series Z Master
78500 DFS Vac Collection System, 100 Series Z Master
78510 DFS Vac Collection System, 400 Series Z Master
78513 DFS Vac Collection System, 2005 and After 500 Series Z Master
78514 DFS Vac Collection System, Z593-D Series Z Master Mowers