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An Easy way to tell how long a shock is required is to measure the existing shock at ride height (tires on the ground as it normally sits) and add 2-3" to get the extended length. If you are lifting it, be sure to add the amout to the original number. Example; as it sits you crawl under there and form bolt-to-bolt the shock measures 16.5". You are gonna add a 2" lift AAL, your total will be 18.5". Add 3 to that for 21.5" and that will be the length needed. If you order a shock that is too long, it will bottom out sooner. 
Options:
-20.5
-21.5
-22.5
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