E-Brake help please

I am putting an 8.75 in my 73 scamp was told it came from a 70 duster it has 10x2 sbp, the cable on the rh side is much longer the the old 7.25 and is bigger in diameter, can I swap the cables from the 73 and put on the 8.75 and the adjustment bar that looks like a j bolt where does it fasten down at?