For a 30" × 84" × 1-3/4" thick pocket door, the required rough opening is approximately: Width: 61" , Height: 88-1/2". However, there is an important issue: 153070SC is sized for doors up to 36" × 84", while Johnson Hardware specifically lists 152670SC for a 30" × 84" door. The 152670SC accommodates doors from 1" to 1-3/4" thick, so your 1-3/4" door is within its range.