Don, I was not trying to talk down your rig or argue with anyone - I was trying to help. But I don’t like repeating myself over and over, so this will be my last reply. Take it or leave it , doesn’t matter. Many of use shot the old B78 and have been through the mounting woes of dealing with the two height bases. I’ve used genuine browning rings, burris and leupold on B78’s I’ve known over the years.
The front and rear ring in your photo are clearly not the same brand, and the rear ring with its angular contouring is obviously a millet ring. (As a side note millet rings are notorious for leaving brutal ring marks on the scope)
If you want it to be all “original” you will need to find the browning made rings for the B78. They came with the two different height rings in one box. WGP in Edmonton was a huge browning parts dealer, if anyone in Canada still has a fresh set of rings it will be them. Unfortunately Erv retired so you may have a bit of a time getting the answers you seek.
That said, if you want to run different rings and don’t care if they’re browning, any “standard” rings (dovetail front, windage adjustable rear) will fit the bases. Redfield, Burris, leupold, browning, buehler, millet, etc etc. just keep in mind the issue is the different heights of the front and rear base.
You will need two sets of rings to accommodate. If you remove the rings from the bases and put a straight edge on the top of the rear base, you can see and measure the height difference.
Good luck
Ps looking forward to the trigger adjusting thread…