I have, but i dont. =P
All I did was drill a hole through the bonnet hinge and put the ball thing through it. For the other end I got a small block of ally and put 2 holes in the bottom and 1 in the side. The 2 holes go through the side of the bonnet (near where it sits on the bonnet rubber) and the hole in the side holds the ball thing.
I got mine from a 4WD store and they gassed them after they had seen how i was using them. I feel they are a bit too heavy as it takes a bit to pull it down.