So my Buddy with a 351 / Champion Rad / Explorer dress used this lower hose and made the 88-93 Mustang upper hose work for him.
Whether Explorer or Mustang, the water pump exits on the Drivers side.
Now I remember that that the Mustang upper hose fit a little better than this picture shows? ?:?
I am still looking for pictures of my 75 that was Mustang front dress...But it has been 16 years since I owned it. I will keep looking.
On the lower hose with a Mustang front dress it kind of matters on where the PS pump is mounted. If it is high up from a rig that had no AC or down low with an idler pulley (in place for the removed ac compressor) High position/AC delete - shown in the last picture...
On the Mustang heater tubes... One of the discharges is 3/4" and the other is 5/8". I am pretty sure I remember that the larger on is the supply side from the intake. On that fitting I used a the same by-pass hose from the thermostat housing to the water pump, as one side is 3/4 and the other 5/8. You shorten the 5/8" side a little and install your heater control valve in that one. For the other end and the return hoses... Gates makes 5/8" hoses with 90* bends in them of various lengths. You can cut them down and splice them if need be.
