I have a Volvo penta aq120b with an aq270 outdrive. I'm going to pull the upper gear to replace the u-joint bellow and I've read in forums that I need to replace o-rings, fwd and aft seals and PDS bearings. I'm new to outdrives so I have no idea where all these parts are located or what they look like. I also can't find anything labeled PDS bearing in the IPC for my outdrive. Does anyone have pics or more specific info on where these parts are located and where to order them from?