Dirk,
I nabbed my shroud from Bud's Benz it definitely wasn't cheap, 325 bucks for plastic! I actually haven't seen it personally yet. I had it shipped to The Brassworks where I'm having the radiator "restored" and changed over to a modern higher efficiency core design. The radiator needs the threaded tabs to mount the shroud since my 230 never had a shroud from the factory. They did a great job on making me a new heater core to replace my leaky one, at a much more reasonable price than MB, so I have faith in them making it all work!
I'm planning on just going through the Hayden fan clutch catalog and finding a "heavy duty" application clutch and modifying mounting to make it work. As for the pulley I might end up having something made or scouring a catalog if I can't find a 280 short pump pulley. I'll gladly disclose my recipe with part numbers if I can make it all work!
@WRe, optimum fan placement should be about the middle of the exit of the shroud. Too far in there is more turbulence, too far out you are just moving air around in the engine compartment. Depending on how tight the shroud sits to the radiator some high temp silicone foam tape at the contact points would insure that the air is drawn through the radiator and not from the sides. Im shooting to have about 20mm of clearance between the surface of my clutch at the radiator. I'll spec the clutch so it ends up halfway out of the shroud.