Okay. I'm going to flog a dead horse here...
I've been working this toolbox to get it to fit. I'm still happy with it, but if you're nitpicky, you will have to break out the metal working tools. Fitting up the new 'box I found that the left side (the side which sits on the trans tunnel) stuck up too high and would not be able to be welded to the back floor/riser. I measured it up and indeed, it's over a quarter inch taller than the original tool box. Here's the curve from the new box hacked out and compared to the old box.

And, the corner piece they used is not shaped well: It is not formed into a 90 degree curve (original curve in front, new curve in back in image below), the way it is welded to the box is not very good looking and the box top lacks the notched quadrants in original box. In other words, the curve on the top of the box is not a nice 90 degree curve "set in" about 3/16"....you'll see what I mean further down...

It was also welded crooked with it sticking up at the edge over the tunnel.

I decided to remove the curve section and replace it with my original curve. The original needed rust repair so I did that, then massaged the new box: I straightened out the side flange and reformed it 3/8" higher so the box top sits lower like it should and meets up flush with the rear floor. I re-flanged the flaps where the curve is to be welded. I also reformed the top so it's got the proper set in "notches" at each end of the curve.

I spent some hours on this and wondered why do I bother with this stuff, but I guess it just is something I enjoy fixing.
So that's it, I promise! I'll report on my thread in the "stock 3A" sectoin about the rest of the metal work underway.