Actually I should expand on that. CarQuest has one without a flange, or tool. You drive it on with until it is flush and then tear the front potion away so the seal gets to ride up on the shaft first. The other design has a flange and a tool that fits down over to drive it on by the flange.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!