I cannot find the Philips RQ12 shaving unit in store
If you are not able to find an RQ12 shaving unit, you can buy an RQ12+ shaving unit. This unit will fit on your SensoTouch 3D shaver.
Note: The next time you need to replace the shaving heads, you can simply buy SH90 shaving heads. These shaving heads fit in the RQ12+ shaving unit.