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 6240-00-057-9498
NSN 6240-00-177-0385
NSN 6685-00-834-9187
NSN 5985-00-277-2423
NSN 6110-01-552-5219
NSN 5965-01-032-0940
NSN 5950-01-229-7484
NSN 5910-01-085-2958
NSN 6240-01-149-4861
NSN 5910-01-089-6834
NSN 6145-01-369-0829
NSN 6240-01-659-3149