A LONG time ago I had an Audi 5000 TD with a bad head (the prechamber melted away :cry: ). Turbo diesel heads were hard to find then too (about 15 years ago). We eventually got a hold of a N/A head, and drilled out the holes for the larger head bolts. I never had any problems with it. You might also try
www.car-part.com. I just looked, and there were a couple of N/A heads on there. There were quite a few complete N/A diesel engines, and possibly one complete TD engine.