bolt pattern disc brake q

I don't know for sure, but I would guess that since it is SBP it would use the small ball joint like the 67-72 cars, so you'd only need the spindles. I looked in my parts interchange manual and it doesn't even list drum brake cars for 76, so I can't say for sure. I suppose you could measure to see if the UBJ is 1-7/8 or 1-13/16.