They run from the tail panel lower seam to just behind the shock mount crossmember IIRC. Been a little while but I don't recall having to touch the crossmember when I did them. I sectioned the new floor pan just behind where the reinforcements were welded I think.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.