Well I got the battery box to go in, but the box does not fit very well. The firewall angle is different than the battery box. The firewall tips at 49 degrees and the new box tips out at 56 degrees, so the box will not sit flat. There is about a ½ gap. I checked my driver TR3 and it is also 49 degrees , so it is the new box. I wish I would have checked the angle before I started because I cut the top lip off the new box, so I doubt if they will exchange it. I did not want dig into those welds under the cowling. I cut the box as high as I could to use the holes in both places at the same time on both boxes and that part worked out well. Maybe there is a way to bend it and push as I weld it down. Did your boxes lay down flat or did you have to force them down.
The box has one of those Heritage made in UK stickers on it. I purchased my stuff from VB, so I will call Moss and TRF to see if they use the same vender and if not I will purchase another box if the angle is correct. I might call VB also because I bought floor pans and sills ect...at the same time, so the order was pricey.
In addition I used a blunt rotary file to cut the spot welds and that also worked out well because the file only cuts the lapping surface at the weld and does penetrate the other piece much, so I only get one hole and no drilling. Fortunately, the holes line up fine and the cut is high enough where it will not show much.