The R-0111 vertical filler is used primarily as a vertical ledger board. If purchased for a frame to a rough-in opening, the position is fixed by the pattern of the building R-panel siding. This single segment component is designed to only fit between two major ridges and it is not designed to span a major ridge. If you need a vertical component to frame an opening, we recommend our RK frame kits or the R-0125 which will allow more location versatility. Better - email us at info@hasletproducts.com and let us know your cutout dimensions.