Hello, I'm new to the forum and motor maintenance so bear with me. I purchased a Sierra water pump kit 18-3383 with new housing for my J25RLCNB motor. I recognize all the parts except for the o-ring that came with the kit. When I removed the old water pump there was no 0-ring anywhere. Where does this O-ring go? It has a slightly larger diameter than the drive shaft. The only place it seems to fit is just above the drive shaft oil seal below the pump but this does not seem right.