Not sure what you are calling baulk rings are? Been a long time since I dug into this parts. Think I remember a few loose rings in a small plastic bag. Been an awful summer in AZ. The OD parts are store on pallet shelving in an uninsulated garage. Weather tight so no issue with rusting. Going to convert a 73 to a four speed with a PTO winch and Fairey overdrive. Once it cools off I plan on getting the OD stuff more accessible.
Please show me a picture of what your calling a drive collar. I remember I had one OD where the special lock system on the thread end of the transmission tailshaft had come loose and had to use a lathe. Was lucky I have excess to a full machine shop before I retired. I remember most the bearings and shaft for the idler gear I had plenty of other things a few or no spares. Plan to keep enough spares for my personal use and sell the others.