I took measurements of some of the CCV components this weekend while putting in my catch can system.
OD of the output fitting for the CCV (not including the o-ring): 25mm (0.984")
ID of the plastic elbow that goes on the CCV output fitting: 26mm (1.02")
ID of the plastic elbow on it's outlet side: 16mm (0.63")
OD of the corrugated plastic tubing: 24mm (0.945")
ID of the corrugated plastic tubing: 19.5mm (0.768)
One thing I noticed was a ton of buildup around the rubber reducer in my system. It turns out whoever installed the metal band clamp that's supposed to secure the corrugated tube into the rubber reducer did a poor job. It was pretty loose and I was able to pull the corrugated tube out of the reducer without cutting the band clamp.
The -10AN hose recommended in the linked post has a nominal ID of 0.56". I decided instead of using 1/2" (0.5") barbed brass union fittings I'd go a size up and use 5/8" (0.625") ones. I bought a
5 pack on eBay for $12 shipped. These worked very well with the -10AN hose. For the silicone elbow I also sized up a bit and went with a
1" to 5/8" version.