Didn't need to, the bottom fit good. Talking to Brian who is the manufacturing manager they could not duplicate the OEM top tank so there is about a 7/8 of an inch gap. I took my radiator and shroud to a buddies fabricating shop and made up two pieces to fill in that space. We designed them to go underneath the shroud so it gives a nice clean look. It came out really well and we used copper rivets so they wouldn't split the plastic shroud. I sent the second piece to Brian at cold case and they plan of fabricating them and I would believe that anyone that is going to run a OEM shroud would get that piece.