Daniel A. Mitchell wrote:

For a 12" lathe you'd likely want the '200' series (aka; "BX' series) size.

May be true. The 12" is right on the line.
Depending on space between top of compound and CL of spindle, either may
work. Should be a simple measurement of existing AXA and BXA toolposts:
lowest toolbit height with largest (1/2" or 5/8") bit, and highest
height with smallest (1/4"?) bit. CL needs to be within that range. Right?

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Rex Burkheimer
WM Automotive
Fort Worth TX