I recently had the engine coupler fail on my 1989 Mercruiser 4.3L with engine serial number OC665952 and drive serial number OC717595 so the engine has to come out. I plan to replace all items on the rear of the engine since the engine is out I have purchased all part. The question I have is, I have purchased new bushing for the rear fly wheel cover engine mounts they are the old style without the serrations and require the double wound lock washer. Can someone tell me if there is a up or down for these bushings one side has white paint them but other than that they look the same from one side to the other.