69 Camaro custom shock height

[HawkX66]

My 69 sits a little higher than most 69s. I like it that way and I want to use regular shocks, not air shocks. I've been looking around, but I'm having trouble finding something that will fit or finding a way to search for certain heights.
It currently sits right at 19 3/4" shock length at rest. I figured about 12"-13" compressed and, what, 23" extended?
Any suggestions on how I can track down a shock? I don't want to use extenders either.

Thanks.

Currently no shocks installed in the rear. Yes, I tightened the shackles etc. with it on the ground.