Adams Rite 41-0902-04-IP Metal End Cap Assembly is used on the 3100, 8100, and 8200 which are their Surface Vertical Rod devices. Replaces the 41-0901-04, which is the plastic version. We find the number 23-0601 cast into the cap.
The Adams Rite 31-0265-01-IP is used on the current versions of their devices for Cylinder Dogging. Cylinder Dogging is when you have a Mortise Cylinder to lock the device in the unlocked positions (Dogged). Very similar to the Hex Key Dogging Assembly, but the mounting plate is longer.
The Adams Rite 41-0131-119 Metal End Cap Assembly is used on the Latching Side of the device. It is used on the P8700 and P8800 Narrow Stile Pullman Exit Device.