An additional thought:
The killer on these small parts purchases is often linked to the cost of shipping. The last time I bought this oil seal I bought a half dozen and tossed the excess into my spares box. It made my shipping charges more tolerable. You may want to buy something else at the same time to amortize your shipping charge. Example: possibly add some oil filters or air filters, etc. ? Another avenue to order low value items is to go to your local Honda dealer and place your order via their parts dept. My local dealer just charges me his price for the item(s) and its shipping cost is buried in his shop's weekly parts shipment (sometimes his distributor offers free shipping to the dealer for large enough stocking orders). My dealer's prices are usually more expensive than most internet sites, but I save the shipping charges, and thus shave a few dollars off my single item purchase. Anyway, you have received good part number info above and can be confident that your seal will fit properly.
Regards,