What year is your engine? Somewhere around 75-76 the left side boss on the block was moved forward 1 inch-they started using a slightly longer starter. I think they left the old boss on the block, but it wasn't drilled and tapped. So-the early left brace is shorter than thae later. Passenger side remained the same. Also 904 and 727 used the same braces. I have some tucked away and already painted if I can find them.