A method of making a contoured internal limb, the method comprising: providing a tubular segment of graft material; laying the tubular segment of graft material substantially flat, the tubular segment of graft material comprising a left lateral edge, a right lateral edge, a first length extending from the left lateral edge to the right lateral edge, and a second length extending from a proximal end to a distal end of the tubular segment; contouring a proximal portion of the contoured internal limb from the tubular segment, the proximal portion comprising a first length smaller than the first length of the tubular segment and a second length extending from the proximal end of the tubular segment and along a portion of the second length of the tubular segment; contouring a middle portion of the contoured internal limb from the tubular segment, the middle portion comprises two sections, the first section extending at an angle from the proximal portion to the right lateral edge of the tubular segment, and the second section extending from the first section and along the right lateral edge of the tubular segment for a length smaller than the second length of the proximal portion; contouring a distal portion of the contoured internal limb from the tubular segment, the distal portion extending from the second section of the middle portion and tapering to the left lateral edge of the tubular segment to the distal end of the tubular segment; closing a right lateral edge of the proximal portion and a right lateral edge of the first section of the middle portion; and removing the proximal, middle and distal portions of the contoured internal limb from the tubular segment and maintaining the second section of the middle portion as circumferentially continuous. providing a tubular segment of graft material; laying the tubular segment of graft material substantially flat, the tubular segment of graft material comprising a left lateral edge, a right lateral edge, a first length extending from the left lateral edge to the right lateral edge, and a second length extending from a proximal end to a distal end of the tubular segment; contouring a proximal portion of the contoured internal limb from the tubular segment, the proximal portion comprising a first length smaller than the first length of the tubular segment and a second length extending from the proximal end of the tubular segment and along a portion of the second length of the tubular segment; contouring a middle portion of the contoured internal limb from the tubular segment, the middle portion comprises two sections, the first section extending at an angle from the proximal portion to the right lateral edge of the tubular segment, and the second section extending from the first section and along the right lateral edge of the tubular segment for a length smaller than the second length of the proximal portion; contouring a distal portion of the contoured internal limb from the tubular segment, the distal portion extending from the second section of the middle portion and tapering to the left lateral edge of the tubular segment to the distal end of the tubular segment; closing a right lateral edge of the proximal portion and a right lateral edge of the first section of the middle portion; and removing the proximal, middle and distal portions of the contoured internal limb from the tubular segment and maintaining the second section of the middle portion as circumferentially continuous.