Well, I hope we can get a bunch together! This is especially true because I have noticed that there is actually LESS info at Deere.com than they used to offer. You used to be able to go into the specifics of options. There would be a picture that showed the application, as well as application notes. Most don't have them now.
Here is an example of what used to be very common:
2000 Series Power Beyond
The power beyond kit allows accessing pressurized hydraulic oil at the rear of the tractor for operating attachments equipped with an open center control valve, such as a backhoe and log splitter. Required for use of the 46 Backhoe.
BM19290 is for older tractors that do not have a dual selective control valve (DSCV). LVB25603 is for tractors that already have a DSCV.
Source: Deere.com