We didn't install out inner sill but we thought we'd hold it up to show the orientation. The 90 degree angle on the end goes towards the front of the car. The upper edge is open and the lower aspect has a flange which points towards the ground.
Holding up the inner sill
This shows the main stiffening beam in place. It replaces the factory outer stiffeners, and is much stronger.
The shot below shows the "Upper Stiffener" or "V" section in place. It gets wedged in before the main beam and would be welded to it and the outer sill in an actual installation.
"V" section placement
The next picture shows what you can expect when you open up the sills. You can see where the pillars come to jagged rusty ends. These would have to be trimmed back to where the metal was good, then extensions would have to be made to reach the sills. Note that the long plate on the main beam goes towards the rear of the car to pick up both rear pillars.
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