its 3/16 line - you can either buy the whole roll of cunifer line - but you will need a bubble flaring tool (dont do the half double) and metric bubble nuts to go with it

If you are just replacing one line then you can buy one section of green armor line from autozone, oriellly etc. it comes complete with bubble nuts and flares, you use the bubble flare at the termination end and cut the new line and old line (where its solid) and put a double flare on it and join it with a union.

to bend the line buy a bending pliers from harborfreight and bend the lines into shape.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)