Leaf spring relocation - shackles to frame

I recently purchased this 69 Dart with the leaf spring relocation kit almost complete . I have no instructions or paper work plus have never seen a finished product . Before I weld in the tubes thru the frame on the rear for the shackles is the a set measurement for how far tube stick out or am I grinding them flush ? I have new hotchkis leafs and anti sway with PST shackle kits . The width makes me think tubes remain the width they are now . Can someone post me picture of a finished welded tube ?

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