Originally Posted by bikersmurf
I've swapped a stock 74 roll bar for a newer 77 bar. I didn't have any problems with the hole spacing... Therefor I believe the side rails are the same length, but the bend has a smaller radius to clear the latch for the rear windows.
That is probably the difference. I have a couple stored away. I know the grey was out of a 79 or 80 but the black I have no idea except it's pre 78 model. Next time I'm around where this are at I need to compare them to the one in my 76.
Looking at the pictures I can see the longer radius on the one in my 76. So I guess the black one I have is from a 77.