8 & 3/4 rear brake conversion to disc info

I need some help on buying a conversion brake system. I bought a Yukon bearing kit for the rear axle but Now I've decided to convert the rear brakes to disc. I see that they say you have to use green bearing. I need to know if the Yukon bearings will work. I don't know the difference.And the old bearings had a adjuster on one end do you still use that. I was looking at the wilwood or The summit brake conversion. Can I get some help here ? Thanks, Derek