I just went through this too. Nobody offers these components new as it seems to only fit 74 e bodies.
If you want original , there is a shop that has these pieces used but in good condition. I paid
50 bucks for the bearing assy. I've gotta look around for his name and number if you want it.
I assume you don't have bolt holes in the lower column housing? I thought about it after I
got the bearing, you may be able to just drill 2 holes and use the 2 bolt bearing set up. If you need
more info just let me know.
Andy