I am CERTAIN that with my '63 Impala sedan having 5 or 6 on each side, you're missing some.
(1) @ the radiator /Frame mount, (2) under the firewall, (3) (maybe) under the front door, (4) around the rear wheel arch, (5) after the rear wheel arch, (6) at the rear bumper area. Big Dave? How'd I do ?? ~ mitch.