These black ABS roof corners are original coleman/fleetwood parts. They were designed for the off road series such as evolution, cobalt, scorpion, E1/2/3, etc. The two pack includes a Curb Side Front and Road Side Rear (when looking at the camper standing in front of the coupler. We have found that if the opposite side is needed that by putting an extra layer of putty on the top corner piece that they can often be used for all four corners. This measures approximately 11" in length and 3.25" across from one corner side to the other.