Gentlemen,
Here are some views of the original design headers and sidepipes for the JBL Chassis.
Note: Primaries are 1.75 X 35 inches Secondaries are 3 X 34 inches. These are not the same as current as the rear most tube does not go up and over the engine bay upper rail as this was difficult for changing plugs.
However the current units should still be close to the lenghts of the original design.