I did a random look at the service manuals for 6 or 7 different units, some B and some non-B. Every unit had a different part number for that antenna. The 2230/2245/2270 shared a part number. On all of the other units the part number was different in the last two digits. I can't say this means others won't fit, but in general, it seems Marantz uses the same part numbers between units if the part is the same.