The 143896132 is not listed in the Crafstman cross reference I have. The closest is 143.38412 which is an OVRM-905, a 143.396132 which is an OVXL-120, a 143.436132 which is a OHV-125.
The OVRM stands for Overhead Valve Rotary Mower,
The OVXL is Overhead Valve Vertical Medium Frame Extra Life
OHV is Overhead valve Vertical.
The OHV could be labeled anything from an 11-13hp with a 21.82ci.
The OVRM 's were from 5-10.5hp, but according to the chart in the manual, were only 10.49ci.
It only lists the OVXL as either an OVXL120, or OVXL130. Meaning they were probably rated at 12-13hp.
Maybe someone else has a better cross reference chart.....?