HBL5666VY MC42-2004H M-1777 05-2000 alternative is MC-42 21414B IAE6F10027 23 (obsolete - replaced by HBL21414B) HBL21414B 20509002 GFR5252A (obsolete - possible replacements all below) HC1804A-24V 39EA15 39EA16 39EA17 39EA18 39EA19 39EA20 V-40SC V-90A, 10'Long Inverted V-Bar;