Backboard Strap, 2-Piece Speed-Clip Plastic Slide Buckle 5' Nylon - Penn Care, Inc.
Amazon.com: Buckles for Straps 1": Side Release Buckle Plastic Clip 10 set + Tri-Glide Slide 20 pcs Fit 1 inch Wide Nylon Webbing Canvas Strap, Heavy Duty Replacement Backpack Dog Collar, Dual