If you have an assembly manual for your car, it should show this in there. On my 66, there are 3 for an AM radio car or 4 if it has AM/FM.
One small one goes from the frame to the inner fender down near the battery. (your car probably has plastic inner fenders so this wouldn't apply) There is also one from each valve cover to the firewall. If AM/FM, there is one from the frame to the firewall near where the speedometer cable goes into the firewall.
1972 may be different so check a manual to be sure.
------------------
Bob (Pa.)
1963 Impala 283
1966 Chevelle SS 409
1969 Malibu 307
1972 Malibu 307
1969 C10 stepside 350
1971 Cheyenne 20 3/4 ton
Somebody stop me...
Looking for Chevelle or Impala parts? Click here:
Chevelle parts for sale
The 348/409 Chevrolet forum
http://www.network54.com/Hide/Forum/187005