Researched it.
CURRENTLY UNAVAILABLE. USE BR-621. New cast iron bearing retainer for 1968-1972 18 spline transmissions with 308 front bearing, 4.805" outside diameter, 4.16" bolt circle, replaces cast #C97621 and 2801892 original retainers. Gasket and seal included.
So I presume this won't work on a 23 spline 833. The bolt pattern being different?