Not sure I buy the part of the filter element being made just for them but possibly The Brains getting a little fogged up Somebody with one would have to do the measuring against the ford versions of which I believe there were more than 1
Yes, the early Ford type was pretty much the same, but equally as impossible to find...
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.