Part #499502H-NR (pictured) has a snapring clip which acts as a flange to seat the
bearing. If you're not sure which style your application requires choose the bearing
with the snapring clip, if the clip's not required it can always be removed with pliers.

Stamped steel outer casing with a flange to seat the bearing

2.047" OD - An axle bearing with a black eccentric lock collar sitting on
top is pictured above. The lock collar is included when you purchase the
#SA205-16 bearing for 1" ROUND axles. Manco brand go karts don't use
the lock collar. Order Part #3941H for Manco Karts with 7/8" HEX axles.

Kit includes (2) Part #SA205-16 - 1" ID self aligning axle bearings
with lock collars, (2) sets of Part #1760 bearing flanges, (2) thick
steel bearing hangers (weld to frame), bolts and locknuts. Everything
needed to install a 1" ROUND live axle to your frame, except the axle.