Brewsmith,
Sorry, I went ahead and bought the ferrules I needed and now that we have them my boss doesn't want to give up the 4" ones in case we need it down the road.
I do have, however, 2 pneumatic-actuated 4" valves you're interested, and I'll have to look but I might have more 4" clamps than I have ferrules, so we might be able to sell some of those.
Nate