For Husqvarna's late 80's and 90's "small body" riding mowers, identified by the fact that the hood is completely plastic (in the newer "big body" models, metal + just the front "grille" is plastic). Several brands, including Husqvarna, Jonsered, Partner, Rally, Wizard, etc., etc.
Belt between engine and cutting device (36"=92cm). suitable for example models (prod no) 954130023, 9540034-21, 954-13-00-23, 954-00-34-21