the 7.25" in my '76 duster uses a sealed roller bearing w/o adjustment, so it has to be a straight roller or ball bearing...I can't remember which at the moment.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)