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Hi Clffy. I made up a little L bracket setup and used existing captive threads on the fire wall to hold up my catch can on the CRD. Pictures will tell you more. This was my backyard job/idea and it worked. Others I have seen have a more professional approach. I'm not much of a fabricator.
As for reducers. I don't remember its been a while since i sold my 3L. The catch can out side I had to reduce...
Also a word of advice. Across the web and other forums, some suggest a xc-xb falcon heater hose... One side of that hose has flared ends and it fits perfectly... However, the heater hose doesn't like oil. I used one (you can see it pictured), and within a year it deteriorated. Stay away.
Sorry i cant remember exact hose sizes/reducers.