A friend of mine just got rid of his Coupe GT locally and he's asked me to sell his Bentley manual for the 4000S, 4000CS & Coupe GT. "Official Factory Repair Manual" for 1984, 1985, 1986, 1987 that also includes the Audi Quattro and Quattro Turbo.
Looks identical to this cover:
It's beat up, but still useable. Only minor rips but the pages are all in-tact.