These are the 1-1/2" (38mm) Standoffs for the O.S. GT55 Engine, OSMG1555. FEATURES: Aluminum construction, blue in color Allows engine to be mounted 1-1/2" (38mm) from firewall INCLUDES: Four Standoffs Four 5x25mm Socket Head Bolts Four 5x15mm Socket Head Bolts Four 5mm Washers Four 5mm Lock Washers Instruction Sheet REQUIRES: Installing between engine and firewall jxs 12/27/10 ir/jxs