LS Swap Heater Hose 90 Degree Bend Molded Heater Hose 5/8 and 3/4 ID x 4" x 24" LS HeaterHose Combo Kit. 5/8 and 3/4 hoses Kit includes one 5/8X4X24 and one 3/4X4X24 hoses Our custom molded hose is great for your LS with tight clearance on the passenger side of the engine bay.