Nate,
you can find such information in the ENTITY-MIB. The exact object instance depend on model and hardware configuration (which slot contains the SE).
Two examples:
ENTITY-MIB::entPhysicalContainedIn.1000 = INTEGER: 2
ENTITY-MIB::entPhysicalName.1000 = STRING: Linecard(slot 1)
ENTITY-MIB::entPhysicalDescr.1000 = STRING: Supervisor IV with 2 1000BaseX GBIC ports
ENTITY-MIB::entPhysicalModelName.1000 = STRING: WS-X4515
ENTITY-MIB::entPhysicalContainedIn.6000 = INTEGER: 6
ENTITY-MIB::entPhysicalDescr.6000 = STRING: WS-SUP720-3B 2 ports Supervisor Engine 720 Rev. 5.9
ENTITY-MIB::entPhysicalModelName.6000 = STRING: WS-SUP720-3B
HTH
Rolf