Didn't get the axle parts back on Wednesday, as was originally hoped. A medical appointment went way over time beforehand, so I didn't get there before his closing time. Next opportunity is Monday. I know they are done, I saw them there the day before, but didn't have the trailer attached, so could not retrieve anything then.
With the advice from Phillip that the inner hub grease seals were available, I called in on my local bearing shop yesterday afternoon. I must admit, I was trying not to have too high expectations. I have been disappointed before. You know the type of scenario, 'yeah, we used to be able to get those, but they stopped making them', or some such tripe. I was to be very pleasantly surprised. Not only are they available, but they happened to have some in stock. Two of them, in fact. Just the quantity I wanted! Additionally pleasing was the price, $10 each.
Original seal has 2625 on it, and SITS PRECISION OIL SEAL as well. There is a patent no. but I cannot make it out.
New seal is Alliance Sealing, TC12220. The number C5203 is on a seperate sticker, as seen in the above photo/s. Hopefully the photos and above information will be of use to someone.
Added afterwards: I have found some numbers on side of the new seals. These I suspect would be the dimensions, in imperial measurement. "2.625 3.750 0.500" I believe these are ID, OD, and Thickness.