Single blade support (L.120.11), 28 mm wide., Double blade support for thermal expansion (L.120.12), 45 mm wide., Single blade support, 120–240 mm pitch (type L.120.13), 28 mm wide., Double blade support for thermal expansion, 50–100 mm pitch (L.120.14), 34 mm wide.
Single blade support (L.120.11), 28 mm wide., Double blade support for thermal expansion (L.120.12), 45 mm wide., Single blade support, 120–240 mm pitch (type L.120.13), 28 mm wide., Double blade support for thermal expansion, 50–100 mm pitch (L.120.14), 34 mm wide.