Hello Mr D6130.... Herewith a picture of a FB/BH checkrail fitting. It was all one piece and accommodated pan clips on the outside.This was taken on a work's level crossing by the Clydesdale Tubeworks at New Stevenston, giving access to a huge flat-topped bing. By this time the track had been out of use for many years and had been roundly pillaged. Soon after this most of these chairs were broken.