somewhere around those years the Explorer steering knuckle changed from a straight up top with pinch bolt to an offset top with a tapered ball joint. they don't interchange, it may be different years for the various models.
calipers & anchor brackets are the same for EXs and Rangers for many years, so a kit for an EX may fit the Ranger.
around 03 the Rangers 4x4 knuckles changed to accommodate larger 12" rotors, calipers stayed the same as the knuckle pushed the caliper out to fit the larger rotor.
that means you can upgrade an 01 4 x 4 from 11.25" to 12" with a simple 04 knuckle and bigger rotors while keeping your calipers.
that gives you a substantial increase in breaking power. (Kit-Kat anybody?)
you cannot do this with 2wd coil springs. the top joint is different.
you may be able to do this with 2wd torsion bars setup if you use 01 Sport trac 2wd knuckles that are 12", will need verified.
can you tell us where the 13" EX brake info is? I'm interested.
almost forgot, bigger rotors means bigger wheels!!!
there are a few 15" wheels that fit over 12" rotors, most do not.
16" wheels easily clear 12" rotors.
13" rotors means 17" wheels.
Perry