Part Description
1638-2RS also known as RLS6-2RS bearing
Text excerpt from the catalog:
The billet third axle supports ZPN 238958, 238959, 238960 and 238962 are obsolete now, but for those who still have one we have replacement bearings available. Bearing is sealed on both sides and measures .750" x 1.875" x .5625" (19.05 x 47.625 x 14.2875 mm).