Clarification on 73+ brakes

72Dart6pack said

Ask for 69 Camaro with 396 & disk brakes. Lines are 15.6 inchs long. They will be spot on perfect.

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So I just put one side together with the caliper at the rear and the lines seem to be okay. The hardline ends on the rear side (behind shocks) and so I don't think I need new soft lines. Am I missing something?