Are you looking/measuring with the spare tire in place, a full tank of fuel, along with you (and possibly your regular passenger) in the car?
They sit quite a bit differently when properly laden vs parked with 1/4 tank of gas and no-one in it.
Depending on how much you think it's raked, or rather how low the nose actually is, you may want to consider shimming the front up rather than trying to lower the rear.
*side note:
I believe you'll find that those things will probably interfere with the shocks when clamped onto the rear springs.
However, if you feel compelled, they are readily available at almost all of the auto parts stores out there, so no real need to hit the e-bay circus (and take the boning) for them.
For example
these at Advance Auto for $7 (ok, $14 + tax to do two springs properly) and no shipping if one is in driving range.....