I put this together about a month ago. Works well, especially off road in bumpy areas...Replaced original base with 3/4" plywood, bolted 2 valve springs to it with fender washers and lock nuts on the back side, bent a right angle in a 6" T hinge for the front and added a piece of 1/2" plywood at the rear. The springs are wide enough to bear thru the plywood to the frame. Used original seat mounting holes to bolt to.