This post may be applicable to most 'newer' Airstreams with 14 inch wheels and 10 inch brake drums, i.e. 23 footers and shorter.
I thought it would be a good idea to carry a spare bearing set with me, so after reading all the applicable threads, I was down to the bearing supply store today. No problem with the cups and cones (races and bearings), the part numbers in the Parts Manual for my '09 FC are clear. The grease seals were more difficult, a previous thread indicated that Timken #473336 should work, but my supplier came up blank on that one. A cross-reference book suggested that the SKF double lip #17146 should fit the bill. Dimensions are not quite right at 1.719 X 2.561 X 0.5, but the dealer said that there is room for some tolerance on the grease seals.
Does anyone know through recent experience the correct Timken part number for this seal, and/or whether the SKF seal that I purchased is correct?
Below is a photo of the parts for replacement of bearings/races/seals for one wheel. In case you're interested, my cost was 45.14 Cdn for these parts including GST.