I don't have an answer for you, but I do have a suggestion- use a digital camera next time. Anytime I rip apart anything mechanical nowadays, I take a good half dozen snaps from various angles with my camera. Then I take the camera with me to Home Depot/parts stores.
You may want to try Sears' website and find the exploded diagram under the Parts section. I tried plugging your model number into the site, but it couldn't be found. See if you have a different model number somewhere. For instance, mine is 917.270913, yours may look something like that. Sometimes it is hard to translate an exploded parts diagram into what you see in your garage with a flashlight though.
Actually I am about to embark on changing both belts on my Craftsman. I had to replace the mower clutch cable since the attachment to the handle snapped. Unfortunately the deck still doesn't activate when I flip up the lever. I think the belt may be old/loose.
Eric Soyke, July 2005