A shock needs 2" of compression and atleast 1" of rebound at minimum. All of this is from ride height. For your case you want to pick a shock with a collapsed measurement of 10" as a minimum and a extended measurement of 13" also as a minimum. If you can find a shock in one of the vendors list with a 3" collapse and a 2" extend = 5" stroke (9" and 14") this will work good and a 5" stroke is pretty standard. You want your axle to bottom out on your snubbers not the shock or will destroy your shocks. Longer stoke is not actually better for performance so measure them up and pick appropriate stroke length to suit your needs. The vendors have many lengths and strokes to choose from. I run Bilsteins on my coupe with 2-1/2" collapse and 1-1/2" extend and it rides nice and even better when loaded for rod run.