bumper jack hold down 58

I got what I am told is the original bumper jack for a 58 Skyliner. It has a lifting flat seat that fits under the bumper. I have the lable that displays how to secure the jack but cannot figure how it goes to aviod the roof motoin. Lable looks like no help. Nor do I have the hold down bracket. Can any one help or better yet pics of the correect bracket & method to sucure the jack?:confused:
I did not see a 58 with a bumper jack at the 2013 SC convention.

The jack on the 58 is under the side board on the left side ( driver ) there should be a flap to lift up to access. The jack run's from the rear floor to the top of the wheel house. held with a spring...I'd send a picture but my computer skill's won't let me...Hope this help's. Gregg