This is the one you will need. Best place to buy is from Amazon if you are going to do it yourself.
http://www.amazon.com/Chamberlain-LiftMaster-Craftsman-41C4220A-Sprocket/dp/B006L8CZKI/ref=sr_1_1?ie=UTF8&qid=1424440429&sr=8-1&keywords=craftsman+gear+kit
Last month I needed a new gear for one of my garage doors as well. We called in a repair specialist and he was able to help us find what we needed. Have you tried doing that? I am a big fan of asking for help when I need it. Things seem to get done faster that way. KJ Garage Door Repair
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