Join Date: Aug 2005
Location: Minneapolis, MN
Bikes: '83 Trek 500 built up with modern & vintag parts, (original owner) 1976 Trek TX500 frame, 60's Raleigh Sports 3-speed
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My Sutherland's Handbook for Bicycle Mechanics, 3rd edition - 1980 describes the fit between british and italian headset threads as a "class B" fit, which is defined as:
"Will fit and be serviceable but slight damage to the parts may result."
I would make sure that the steering tube is italian threaded before you actually buy one. While it would seem to be, some manufacturers used british threading for bikes imported to the US. I have no idea if Bianchi did this at any time in the past, but some manufacturers did. Your local hardware store or bike shop should have a thread pitch gauge, just take the locknut in.
I would try other sources before ebay, even though I do buy on ebay, you should be able to find an italian headset from "regular" source. Just my opinion.