I bought new hub bearings for my spare tire project. I got new ones from Walcks and I took the races out of the hub I was going to use. I went to put the new races in, and they dropped right in. Odd... Then they fell right out. I compare the numbers on the bearings and they are different. I have another hub and I take those races out. Same as the ones that I got from Walcks. What gives? I am hoping someone here has insight as to why the hubs and differently shaped and use different bearings. One is scalloped and the other has smooth sections. The one with no wheel studs has the LM501349 bearings and the other one uses the 18890 bearings which is the ones I got from Walcks. Also, the wheel studs are different between the two. The 18890 bearings are thinner than the LM501349 bearings. I seem to think all the jeeps I have worked on had the bigger bearings.