Tailspin - good point to clarify...wasn't sure if you could see the 2 washers in the picture. For mine it took 4 washers total of which 2 were under the top and 2 under the bottom. If you use a washer that is thicker or thinner it is possible that you might need more or less PLUS your firewall should be checked to see if any thrust angle is built in to determine if it needs more, less, or zero adjustment to be sure.