No...the back rest that is currently available only raises the butt chock 4 inches... there was a prototype posted a couple week ago that if it come on the market may be adjustable but only for up and down... I am having one made next week as a special order that will bring the butt chock up 4" and forward 5"...this one will be one off and I have permission from the buyer to smoke off his credit card... When all this started I wanted to do a adjustable unit but it just became to cost preventive,,,,,preventative to the point one could not sell them, to expensive !
Here are a couple of pics of what I have....if you can come up with exactly what you want, I can get it made for you, but it will be exspensive!