Has anyone replaced the oil seal on the speedo drive? I have found 2 part numbers: 90752-250-000 and 90752-253-000. The "250" for early frame numbers I think. Neither of these fits my Dream. I have 3, all are the same and all are around frame numbers CA78-1013261. The speedo drive is the same for all 3. The oil seal has a number embossed on it: TC 34 48 6.5 Y1. Any ideas?