This sheet metal is 3

Bradley 125-092 O-Ring (Spec) 1

square-shaped end cap with sides of 1-1/4 inches in length

which have rough openings that measure 15-5/8 inches in width by 11-1/4 inches in height by 4 inches in depth

Bradley Mills Partition Aluminum Stirrup Urinal Privacy Screen Hardware Kit

ASI 74022-SSM Toilet Tissue Holder - Double - Satin Stainless Steel - Surface Mounted (ASI 39 Dry Wall Clamp & ASI R-009 Theft Resistant Spindles Not Included - Please Order Separately as Needed) Nominal Size-12" X 1.5" This sheet metal is 3ASI 74022 SSM Toilet Tissue Holder Double Satin Stainless Steel Surface Mounted (ASI 39 Dry Wall Clamp & ASI R 009 Theft Resistant Spindles Not Included Please Order Separately as Needed)