I look at the Explorer/Mustang/Ranger as similar brethen under the Ford banner.. That being said I have done and seen done Mustang engines installed in Rangers and Explorers...
I personally have owned 4 Rangers with some variant of Mustang engine in them... When I bought my current project, the first Mustang item used on it was a stock 87-93 fuel pump to replace the varnished one in the tank...
I have also used a 130 amp alternator from a 95 Mustang I had laying around and pulled the coil pack from a 98 V6 Mustang to test for spark when I wasn't sure the Explorer coil pack worked.. I left it in place so far for 4 months...
When you see my Explorer I am obviously using 95 Mustang wheels and the tires are not the normal truck size either but 255-60-16 since this truck sees very little/no offroad although if I did need that capability I could run a 70 series tire without issue...
I look at some of the other items like the power steering pump or the water pump which is a common part for both a Mustang and/or Ranger, depending on engine application and model year...
And don't forget that lots of folks running rear disc brakes are doing so thanks to an Explorer swap into their vehicles.. I did it on all of my Rangers and I know people that used that rear axle to complete the 5 lug conversion in their Fox body Mustangs...
And though I am not running underdrive pullies, I really think a set from a v6 Mustang would fit and work just fine.. Maybe I need to look into that...
Or now that the Explorer uses the 4.6 liter engine, I can set my sights on dropping in a 300 hp Mustang 4.6 in front of the Explorer 6 speed automatic and use a few go-fast goodies from the aftermarket...
This truck is a project after all!!! A project that hauls lumber outta be able to haul a*&, right??? Dang, time to start searching for harnesses and other parts... again....