I am trying to identify the air dryer on my 94 diesel Vectra. So far I am not finding a match. I would like to either replace it of get a major rebuild kit for it. It looks like a KN33000 but it's much shorter. Plus the specs I just read on the KN33000 state it's not compatible with a Holset compressor on my Cummins. The dimensions are 9" tall and 7" diameter for my dryer. Can I replace the whole unit with a different dryer? If so any recommendations? Why are many dryers not compatible with Holset compressors? 
