Note that framesets and bikes come with a spare hanger. If you would like an extra or need a replacement you can order here.
Ti V1 derailleur hangers are for titanium frames with 8 digit serial numbers that begin with 0619XXXX or 0620XXXX.
Ti V2 derailleur hangers are for titanium frames with 8 digit serial numbers that begin with W201XXXX.
There is only one version of hanger for Allroad AL (aluminum) frames.
You can find the serial number under the bottom bracket.