rear shock question
 

so I just lowered my 2000 2dr blazer, went with 3/3 using blocks and coils, put new belletech drop shocks in front, did not do rear yet because I have a question. I noticed when I put rear end back together that the rear shocks were extended, so to my question, when I buy new shocks for back there will I be buying longer shocks? And if so do I just add 3in to the stock shock size? thanks guys and pics are in my garage.