Sometimes you end up answering your own question.
GOOD NEWS! A Type 26R battery fits just fine, and its a heck of a lot cheaper as well.
I won't bore you of the details of my research, but I picked up a VP-26R 540 CCA 675 CA EverStart battery at walmart for $55. Probably cheaper where you live.
It not exactly the same size, just a tiny bit bigger in all dimensions, but not so much that it does not fit. It does!
As they say, "Pics or it didn't happen!" Sorry that some pics are upside down.
Comparing the lengths.
Weight of Motocraft BXT67R 26.8 pounds
Weight of EverStart VP-26R 26.8 pounds
The hold down bracket fits better on the EverStart than on the Motocraft.
And here is how it looks installed, plenty of space.
To get the Motocraft out, it was pretty much the same procedure as for 2016 an older FFEs, the only additional step was to release a fir tree clip on the panel that lifts up.
That panel folded forward, and this gave enough space to lift the Motorcraft out. The EverStart went in just as easy.
NOTE: Tighten the nuts for the hold down bracket only enough to secure the battery, any more, and you are just bending metal.
So while this EverStart only has a one year free replacement warranty, I am sure a better quality 26R battery could be had for still cheaper than the $140 for the motorcraft.