This is a really easy one :-))

I want to use snmp to detect the standby status of the
supervisors in a Catalyst 4500 (SE IV) with recent IOS.

1.3.6.1.4.1.9.3.6.11.1.9 cardOperStatus -- looks ideal
1.3.6.1.4.1.9.5.1.3.1.1.21 moduleStandbyStatus -- looks good too
1.3.6.1.4.1.9.9.195.1.3.1.1 ceExtEntityLEDType -- looks close
1.3.6.1.4.1.9.9.305.1.3.2 - HA stuff -- close too
1.3.6.1.4.1.9.5.1.1.52 sysConfigSupervisorModuleNo -- maybe

Thing is that none of these actually return anything on the 4500.

Several hours of searching later, no result.

Any ideas?