It may be the driveshaft center bearing support.

Here is the manual, section 41.

http://mb.braingears.com/126_DISC1/program/chassis_300SE.htm

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.