Small-hole bottom of the gas tank strainer nuts that hold in the fuel delivery nipples. Long corroded away, these are exact duplicates of the no longer available factory parts.
Replace your rusty, leaking fuel tank with a brand-new (not reconditioned) one with the fit and finish of the factory unit. This tank fits 356 from 1964, but may also fit late '61 thru '63. Act fast, because we have a very limited stock!