Next day, I went at it with the crud thug and removed the undercoating to have clean metal to weld to.
I used the cut offs as a guide for cutting repair sections out of the new houses.
That lump of filler is what formed the lower 6" of the old, rusted out, houses.
They actually fit together and line up well.
Then I removed the rest of the floor and most of the tail panel above it.
The left tail pipe was bent badly over the axle and the extension pipe is gone from the crash. I got the numbers and did a search and both are obsolete, so I clamped on the pipe with the tower and pulled it out, but forgot the camera that day
Yep, the clamp should be right under the hanger. Even THAT seems to be obsolete.