Big bolt pattern and disk brake conversion

Professor Fate said

EVERYTHING is different.
If you're going to the boneyard, grab EVERYTHING for the conversion- UCAs, spindles/knuckles, caliper adapters, calipers, rotors, proportioning valve, master cylinder, lines... even if you don't use it all, you have reference for how it all goes back together.

Click to expand...

Pretty sure the '73+ drum brake UCA is the same as a disk brake UCA. I don't see a different UBJ, so seems like that is correct.

The '73+ drum brake spindle got the bigger inner wheel bearing, it is different than the '72 and older and certainly different than the disk spindle. But I think they standardized the UBJ in '73 so the UCA is the same disk or drum.