These are the 4.5" ones. I don't remember the exact size I ended up with for the spacers in the front, I'll go measure them on Monday. The length I have is not what I would recommend for most people; I have a shackle reversal and high steer setup that changes the clearances required.
One thing I will add is that my front springs sagged slightly over time and now I don't have enough up travel before they engage with the axle. They still work great on medium and large hits, but because they now sit so close at ride height they can induce a bouncing effect on small or rolling bumps like expansion joints. (feels like a truck with bad shocks)
I would recommend having more uptravel than I had in that picture if you plan to make a similar setup.