Whirlpool manufactured brands including Admiral, Estate, Inglis, Kenmore, KitchenAid, Roper, Maytag, Crosley, Jenn-Air, Hardwick, Magic Chef, Amana, Glenwood, and Caloric. All of these front loader conventional electric dryers are very similar. The idler pulley attaches by a snap in spring assembly.
The spring assembly is purchased as one part with the idler wheel attached. If the make of your dryer is different than the above please provide additional information.