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As Don will likely note in the forthcoming update of that book, it wasn't a complete replacement according to the engineering releases and both types of radiators continued to be used through the end of '35 production, with one type assigned to certain cooler climate assembly plants and the other to warmer climate assembly plants, which strongly suggests a difference in the cooling capabilities of the two basic versions (large top tank and small top tank). As noted above they are interchangeable with the correct support rods.