Small Measuring favour

Hello all. If it's not too much of an imposition, I was hoping that one of you fine gentlemen would take a small measurement for me off of late offset 951 rear trailing arms. I could like to know that the distance between the plane of the wheel mounting surface and the spring plate it. I've measured it on my '86 trailing arms, and it's almost exactly 8 inches. From what I've read on here that implies to me that the later ones should be about 10 inches for the same span. Thanks for any help!