A cursory search of the internet has revealed information that indicates the CP used the Nathan K3L and M3H a lot. The Nathan 3 chime that Ring has would be a good one to try first. I have no idea if it's a K3L or M3H or not. You might just have to try all the Nathan K3's Ring has to see if one sounds suitable. If nothing's suitable welcome to the club of having to try and find suitable recordings to make your own horn files.
The bell, no idea at all.
- Tim