I probably missed a good deal on ebay but did not dare buy it. Question, is the gear train the same on the 12 valves and 24 valves. The accessory drive is the one that gets the power steering, the vacuum pump, the air compressor or whatever the model of truck needs. Did the gears stay the same or are they different gears? I intend to put an air compressor on mine and one was offered on ebay from a 5.9 no idea what year, did not dare to buy it. Went for $162 I believe. It will cost me three times that for one.

 

hope this helps, the gasket shape is most diff. not the same.
that is between the outer cover. [they do not make one for the isb eng. so i tried the 12 valve version ....no go.