These drains are located behind the rear splash shields behind the front wheels. Usually they are disintegrated, so only the hole remains.
The cowl drain styles from 1961-1963 and 1964-1966 do not fit this application.
cowl drain- hole side
cowl drain - fender side
Cowl drain still in hole. Judging by the rust, this car was in a damp climate. Usually the cowl drains just dry up and fall out. I am not sure what the "weep slot" refers to. This the driver's side of the car.
Cowl drain hole - passenger's side.
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Another view of the passenger side cowl drain hole.