Auto parts stores carry brake lines in various sizes and lengths. For the Blazer rear axle, the line is 3/16" in diameter. Just measure your line, buy the closest length line and bend to fit. The fittings that come on the lines will fit.
If you have a double flare tool you can make a duplicate of your line very easily.
I don't believe anyone has individual lines but you can check out In Line Tube.
Jim
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