Ok i found what lift im going with.

Thats because this bundle comes with them at stock length. 5100s will work just as fine but really there isnt a price difference or handling difference.

If you need custom length rears for lifted applications just call DSM. they will help you select the correct length of 5125, or 5150 if you want, and still give you a great deal as well as a TW discount.

 

5125's are custom-length shocks, as you can see in my post above. The bundle you linked obviously comes with them idealized for stock height in the back.