Does anyone know what sensor kit I need for cadence? It appears to be the BC series kit, but I am seeing that it works with the 1606 and 1609. I haven't seen it directly listed for the 16.12. The manufacturers number on it is 424, but none of the online listings are labeled with that number (or any other number I can use to tell for sure it isn't the right one). Is there any difference in the wired cadence sensor compatibility? The numbers are different on Sigma's site for the 1609 kit (394), perhaps it will work with the 16.12?