You may want to consider buying a new fitting as well. When I did mine, the hex dead on the fitting is so short that a wrench and a socket would both just slip off. I ended up using channel locks on the threads, which of course trashed them.
The new fitting I got from the dealer had a 3/8 square hole broached in the center so you can use a 3/4 rachet and extension, MUCH better design!