Standard eyebrow or roof height 85 K10?

[schmokinrider]

Hi

I'm trying to figure out the standard height of an 85 K10 Silverado and maybe a copy of the page where it is listed in a workshop manual.
I'm trying to get the pick up registered in Australia and due to the fact it has larger diameter wheels and a bit of a lift kit the assholes won't pass it even though they have no idea of how high it should be.
They told me to come back when I have proof of original height and I'm within 2 inches of that.
I've searched heaps on the net to no avail and don't want to have to wait weeks to order and recieve a workshop manual that may or may not contain the information.
Any help would be greatly appreciated