Hey Andy...I was just going to say the same thing? Not sure what rubber orfice you are talking about? I just did my entire K4 rear assembly and was able to get everything I needed. If you are talking the rubber ring that goes around the inside of the hub that is still available. If you are talking about the oil seal that goes under the bearing retainer ring that is available from Honda too. At least I was able to buy both of mine there this year. But my numbers do not line up with the seal number you posted. As far as the oil seal under the bearing retainer ring, guys are saying you do not need it if you get sealed bearings which is what I imagine you will get.