I've got two or three of these VT12-L's laying around, but haven't used them. I've been using the 8 magnet V-7 sensor in the red package. The disk is 4 mm wide, which is 6 mm less than the VT12.
The tradeoff is that the V-7 can be mounted in 4 different positions, and only one works right. You have to fit it and test for proper PAS operation before you finalize it.
Also, I've never found that the ring will fit under the BB locking hardware. If glued, as suggested, it takes up valuable space and I won't use glue. I end up fashioning a bracket and clamping that to the bike.
In this case, the sensor is on the non-crank side, where I had more room. That may be true on your bike too,