I've had loads of fun (not) trying to find a reverse loom to fit a Subaru double din in my coupe, finding pinout diagrams was near on impossible, finding correct ones, more so
This possibly wont be much use to many/any of you but just in case you pop out your hu sometime and find the previous owner had a fetish for PVC tape and scotch blocks and has mullerd your loom, check out this guy. Subaru WRX radio harness pin-out
There's a full pinout diagram which could prove useful and he sells the pre wired connector (you should try finding a male connector, rarer that a honest used car salesman) for just over $10.......Oh forgot to mention he's in the US.
Anyway Have a butchers and if you ever need it you'll know where to look!

(Sticky please)