Thanks for pointing me back to that thread. I reviewed it again, and I see that the rotor sizes used are tough to fit inside of most smaller wheels. That thread is for rotors that require 16" wheels or larger, the 12.44" rotors are a step larger than the 70's 12" rotors, which were actually 11.72" in size.
I'm aiming for my Ranchero that has 14" front wheels now, and I want to buy the similar Rally wheels, in the 15" size. So a rotor to fit those needs to be just under 12.0" actual size. I learned long ago with custom brakes I did for my 98 Mercury SUV, that a wheel has to be about 3.25" bigger than the rotor, rounded to the next larger size. So my 16" SUV wheels could handle a 12.75" rotor, actually 12.90" for the calipers I used.
So I looked at other possible rotors. The closest I found was the 2001-2005 Sport Trac front rotors, which have the same offset as the CV(1998-2002) rotors others have adapted. The Sport Trac rotors are 12.0", which very likely won't fit inside a 15" wheel. That size would be extremely close, I am familiar with those rotors, having swapped them onto my 99 Explorer and finding two stock 15" wheels that barely went on to roll it around. I actually used stock 99 Limited wheels for my work use, which are 16x7" sized.
So it looks like a tough thing to get a bigger rotor with 15" wheels, other than the stock rotors of the early 70's, or else a 5x5" pattern from the later 70's cars.
I might later on get to test fit my 15" rear wheels from my Ranchero, onto the 99 Explorer front brakes I have from the Sport Trac. Those 15" wheels are an unknown brand, and as close as the fit will be, any other brand would have to be actually tried on to verify they could clear the calipers.