Well, I may be jumping the gun here, but I ordered the 51098 seals. I know my axle bearings are the sealed type bearing and the 3.15 diameter. The seals are not on the bearing but inside on the axle tubes. I purchased them from autorock.com on the internet for $2.87 a piece. They get you on the shipping which was $7.00. I bought two seals for $13.38 which includes shipping. Auto parts quoted me $7.99 each but had to order and that would take 2 days. Hope it works. I'll let you know. A big thank you to prostreet for the great info and help.