Look at it closely, the brass block typically is part of that rubber line. The one on your car now may work.
When I swapped in my 8 3/4 I just elected to put a brand new line there, over time those rubber lines can and will go bad.
CAUTION: If/when you change that rubber line it can be a little difficult to get off the car end. I got lucky and mine just broke loose like it had only been there a week.