I realize the correct way to measure for what I need and yes I am taking a shortcut but I know somebody has went this very route and has the answer. I have a new never used set of 4" Downey springs that are going on my 79 fj40. I am intending on putting a set of Bilstein shocks with this setup. I need shock part numbers front and rear from anyone with a similar 4" lift setup. I'm wanting to go ahead and buy my shocks before I put these springs on. Any information would be appreciated.