I did the installation this morning and am really happy with the upgrade! They are a huge upgrade over OEM. Not only brighter, but much more effective spill pattern.
A few points for your future reference:
1. The 3046R uses the smaller of the two connectors you sent
2. The mounts fit perfectly into the OEM brackets, so the u-brackets are not needed for installation on tractors that already have factory lights.
3. Installation time is about 10 min per light. Maybe 5 at the bench to set up the mount and 5 on the tractor to swap out. Everything lined up perfectly!
Thanks for your help.