7mm bulk silicone hose and is sold per meter. It runs from the reservoir cap to the overflow bottle and is used for various segments of the return line in the engine compartment. The quantity of "1" is for 1 meter. 2 meters is the correct quantity to replace all 4 segments that are in the engine compartment on 86 and newer. 1 meter is sufficient for 83.5 to 85 models. One meter is 3.28 feet or 39.3 inches.
You must use the special silicone hose clamps available here.
Ref ID: 443121107ASIL
Hover over the icon and click to get the detail.