[Randy]

They are interchangeable. The only difference I have ever seen, is that a "correct" 1933 radiator has a little pocket in the top of the side support where it is soldered to the top tank on each side. The pocket is created by a little flare in the side support where the side support is attached to the top tank. The purpose of this pocket is to provide a place to rest the front corner of the hood to keep it from falling down when raised. The '34s have a stamped crease in the cowl top to rest the back edge of the hood on to hold it up, whereas the cowl top is flat and smooth on a '33. All '33-'34 passenger car radiators are the same otherwise. I've looked at lots of '33s and have only seen a few radiators that have this pocket, so I guess many got replaced with '34 radiators over the years. This attached picture is of a 28,000 mile original car.