Rubber voltage insulator nut ..mostly radiator support panel mounted... with internal thread.
REMEMBER or be aware.... this era regular has INSULATED MOUNTINGS....for a reason.. to reduce vibration... so don't do what a few people have done & fasten them metal to metal onto the radiator support panel.. then FRY the regulator.
As per GM original.
Quality as needed.. supplied EACH.
.jpg "Trunk Floor: 55-57 Chev Pan w/out braces *")
