The longer lengths go into the radiator from the pipes that come up from the front pipes that bend up and between the header tank and the two pipes that come from the thermostat and exit the header tank. The shortest two would be used to connect the two long pipe runs under the car. It seems kind of cheesy of Hall to cut them so precise as nothing on a Pantera is that precise. I would suggest you dry fit everything to ensure you have good alignment and everything reaches the next part. Once done, you can make any final adjustments by cutting or swapping a longer for shorter piece and then lock it in.
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