According to the fit-up guide, your model (noted as 27597) does not have a compatible bagger: sears.com/ue/home/2014_Fit_up_Chart.pdf
The 50/54 bagger (19A30018OEM) will not fit any Craftsman 917 model or Husqvarna model. It only fits select MTD (247) model tractors.
You can use these 42" or 52" lawn sweepers:
52" Lawn Sweeper, 26 cu. ft. Capacity Bag:searspartsdirect.com/product/3ybz06g0i9-0071-486/id-45-0546
42" Lawn Sweeper, 12 cu. ft. Capacity Bag:searspartsdirect.com/product/51zyyzjnur-0071-486/id-45-03201
42" Lawn Sweeper, 20 Cubic-ft capacity bag*:sears.com/agri-fab-45-0521-42inch-lawn-sweeper/p-A104257238
*From the manufacturer: "Due to interruptions in purchased parts needed to make units this unit is back ordered (in some areas)"
You can find parts, diagrams, and your owner's manual for your riding lawn mower on Sears PartsDirect: searspartsdirect.com/model/2k1vufawdl-000247/craftsman-917275970-front-engine-lawn-tractor-parts
You can use the coupon code FIXIT for 10% off on Sears PartsDirect. If you need a repair at your home, you can call Sears Home Services at 1-800-4-MY-HOME.
Hope this helps!