I will be doing this on our explorer some time this week, or next weekend (just waiting on wire, relays and connectors from ebay). In Oz, we don't have too any Crown Vic or Mustangs, so I will be using a twin fan setup off a 2000 model AU Falcon sedan. The explorer radiator is 650mm wide, the fans are 680 wide, so should fit quite nicely. Haven't measured height yet, but I reckon the twin fans will be shorter than the radiator, so I may need to use the bottom part of the shroud to seal it all in. I'll post pics up once done.....
Oh, I'm using the davies craig thermo fan kit (0401), plus the top radiator hose kit (0409) for the thermo probe from the same manufacturer. And the relays I have are 3 x 30Amp ones with built in fuse holder too. I've used the same setup on an older 5.0 Windsor powered V8 Falcon, and it worked well in that application, so should go well in the truck too.