Thank you Ben, it gives ma good idea... that I can't fit the plenum chamber of my Sierra DOHC under this bonnet which is the tallest of all body kit's bonnets. As it is now, the top point of the plenum chamber sticks out 270mm over the top rails and is located on the rear/right side of the engine bay.
It means that I will have to make a cut on the bonnet and put an air intake/bonnet bulge, or cut and re-weld the pipes of the inlet manifold of my Sierra DOHC.
You're a natural born drawer, no?

Just kidding, thanks for the dims !
And let us know if and when a wide scoop bonnet is available.
Thanks.