Tool Post, 8x12 and 8x14 lathe
This tool post is 68 mm square and 41 mm tall. The tool-holding slots are 20 mm tall and 13 mm deep. The bottom of the tool holding slot is 7.25 mm above the bottom of the tool post. The center hole is 11 mm.
In your instruction manual, this part appears on the parts list as:
|411||Harbor Freight 44859 Central Machinery Lathe - 8x12|
Various C8-US SIEG Lathe