365 GT4 2+2 Workshop Manual

I'm looking for a workshop repair manual for my 1973 365 GT4 2+2. They seem to be very hard to come by. I tried ferraribooks.com, ************.com and albaco and the only thing I could find was a workshop repair manual for a 365 GTC/4.
In essence, however, there shouldn't be much difference - engine, ignition, carburetors, gearbox, differential and suspension ought to be exactly the same. And these are the topics that this manual deals with. In fact, I remember someone once claiming that for the same reason they never bothered issuing specific workshop repair manuals for the 365 GT4 2+2. Is that true?

 

Thanks to everybody for their help. I have now ordered a workshop manual for the GTC4, which, as we talked about, should be mostly identical.
To Milko - thanks for your tip, I'll try the owner's site in Maranello to see what they have.