Cage comfirmed they are the oem for this item
No other part numbers with same form, fit, and function found.
An item designed for centering and supporting round work without centers, such as centerless armature shafts and the like, in the tailstock of small engine lathes by means of three or more self-centering brass or bronze jaws, or an adjustable collet type brass or bronze bushing. The jaws or bushing may be adjusted for either running fit or driving fit on the round work. It is attached to the lathe by means of a tapered shank. Excludes chuck, drill and chuck, universal jaw.
Classification: Parts and accessories of metalworking machine tools for cutting, grinding or finishing gears
NSN 6650-01-090-0099
NSN 6130-01-147-1130
NSN 5905-01-127-6111
NSN 4140-01-576-6499
NSN 5920-01-316-8286
NSN 6105-01-196-6377
NSN 6220-01-427-2333
NSN 7035-00-104-7613
NSN 5905-00-091-8957
NSN 2925-00-964-7128
NSN 2925-01-603-0186
NSN 5960-00-553-7338