Rail holder's location for reference. Wooden plank required for installation. The gap between door and wall is super small. The wooden plank can creat the space and prevent the door from rubbing against the wall.Plank width:5 1/8";Thickness:1/2" for reference. If you have thick baseboard or door frame, please also count them in. The item "DIYHD Box Rail Heavy Duty Barn Hardware Interior Outside Door Sliding Track Kit" is in sale since Thursday, August 8, 2019. This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Doors & Door Hardware\Other Door Hardware". The seller is "beileli_0" and is located in Carol Stream, Illinois. This item can be shipped to United States.