After being told by several "experts" that Ford never mated the T5 trans to the V6 Cologne engine, I found this to be incorrect.
It turns out that all 2005 to present Mustangs have a base engine that's the 4.0L SOHC V6 and it's a Cologne engine!! It's a piece of crap engine (with the same small oil pump as our 2.8L), but the manual transmission is the Tremec T5!!!! There's also a 5 speed automatic available (there’s one in my town available with only 330 miles for $750).
I just checked the bellhousing bolt pattern this morning at my local dismantlers hub and it is verified - the SOHC in the Mustang is a match to the plentiful 4.0L OHV engines in most Rangers (and several other vehicles) – as well as our stock 2.8L.
My transmission with bellhousing cost $750 and had only 19K miles on it. Full speed ahead with the 4.0 swap and now it will have a bulletproof 5 speed!