Found the PN for the Bosch replacement for the 835I:
ISC-BDL2
The issue I have with the ISC-BPQ2 is that even though it's a quad, it's still a PIR and succeptable to the same falses as a normal PIR, albeit on a smaller scale. Also not "pet friendly" which is huge if you're installing these in a lot of applications or have the potential to have an animal roam into the protected area (garage, barn, etc.)