Meridian Under Seat Front & Rear Access Bookrack, Meridian This front opening has a clearance of 2.5/8″ in height, rear access clearance of approximately 3″. Back Mount Bookrack, Meridian This book opening is 2” x 14”. Please keep in mind this option limits stackable units to 4 high. Side Mount Bookrack, Meridian This is a great addition for the choir loft with a large book opening of 3” x 14.5. Metal Chairs Apex Ovation Prelude REquest Complete Product Catalog