I agree with the back seat discussion, but not for the front.
I had an issue in front when I lean over to reach for my intercom/radio that is on the right side of the panel. My headset would hit the vent. The problem is me, I am 6' 4" with a very long upper body. I have trouble in some cars and even with a very thin cushion, would hit my -6A canopy in hard bumps until the "Almost A -14" mod went in.
In the -10, I lowered the pilots seat by cutting the cushion down 1" and had a new bottom corner made. Still is close.