I'm going to go with the NFB SS147 as well. I found them on ebay for 174 and change. What length is your old system?
I talked to teleflex the other day and he had a great idea for me. Since my steering is not even there to take a piece of garden hose and lay it like it should run then measure and add the 18" and round up. It might make a good check for yours as well just to make sure in case there is any difference in your old compared to the new.Which hull do you have?