I needed to know the angle of the ramps' incline and the length of the incline. I used a block and a piece of 1 x 6 lumber. The 1 x 6 clears the cowling under the front bumper with a little to spare. My old ramps were 8 1/4 inches high where the wheel rested. I would like to duplicate that on these ramps. The base of the incline needs to be about 30 inches long (yellow tape measure).