I usually cross reference parts and get what I can from Ebay, Napa, or anyplace online. Searspartsdirect has a lot of stuff listed, but as far as ordering and getting what you order, people have mixed reviews.
If it's an engine or tranny part they can be purchased at many other sources. It's a tad difficult and many searches will need to be done/ scoured to find the best deal & shipping. Not that I buy a ton of Craftsman parts.. SearsPartsDirect will access the manufacturer's information and you will see that if you look around. (I've noticed that many times in my searches.) I have worked on a few and found that a little looking and investigation has saved me some $$$..
Lots of folks swear by different suppliers and even have purchased only from MTF Site Supporters. So take a look at the MTF advertisers or give them a call as they should be able to help you out. :goodl: