tomorrow is fine, I appreciate your help.
the view in the boot is fine, both where the straps hold the tank, there must be some holes in the bulkhead behind the seats, and also the boot floor where the tank sits, so I can see where to make a hole.
On the 4cyl and 2.5 the fuel tank sits under the boot floor at the side of the spare wheel well, it was moved to in the boot for the 3.0 cars, also hence the differences in exhaust exit. The under floor tank rust readily and is not in the best place if I track it, 2 inches behind the rear bumper. Not a great place to put it.