What year are you working on? On the newer style, with no banjo fitting, the cylinder with the bleeder goes in front, with adjuster pointing up. So brake line would come in the rear port of rear cylinder, then horseshoe shaped line would go in the front port of rear, to rear port of front cylinder, then bleeder at front port of front cylinder.
On the banjo fitting cylinders, I’m not sure if there’s a difference as both cylinders on each wheel have a bleeder? I believe the line from the axle still enters the rear wheel cylinder first. The pic is my 71 rears, passenger side (right).
I believe you can tell too by the way the adjuster is threaded. They go in so that you turn the tool the same way on all of them the tighten.
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