40 Buda 6-bolt wheel stops for HO scale. Price is $0.80 per piece. Based on a CN prototype.Sized to fit code 83 rail; add shims or glue to fit smaller code rail. Clean all residue from the notch for the rail head with an Xacto #11 blade for best fit. Light sanding to smooth out the curved surfaces required. Overall dimensions are 10.15mm long, 9.08mm tall, 3.66mm wide. A precision sprue cutter like the Intermountain BB-1015, Micro-Mark #82393 or UMM-USA GMT01 is the best tool to cut the parts from the support framework. http://umm-usa.com/onlinestore/product_info.php?cPath=21_28&products_id=3749