F12 ride height question

I think i have a slight problem. My car sits lower in the front than the back. I'm not sure whether this is from 21f and 22r setup, like that from factory, or was purposely done by the prior owner. I'm trying to set it back to factory spec ride height minus 0.5" in all 4 corners. I read the factory manual, and the places I am instructed to measure seem to be accessible only with 4 post lift which I don't have.

Does anyone have measurements from wheel center to the top center of wheel arch for 21" front & 22" rear? ideally with 255/30/21" front tires & 335/25/22" rear tires. I want to see if I'm within spec before I get it aligned. Thanks in advance!