I'd get the biggest you can fit if you are going to add one but there won't be that many 6volt options. A lot will depend on how you mount it and how much current it draws. I don't know how high up the grill goes as compared to the radiator height on those models. IMO, if the grill is open with a straight shot to a part of the radiator and part is sort of out of the main airflow, if possible I would place the fan in that area to draw air thru. Hottest water will be at the top so that also might be a consideration.
Here is one OK size but didn't see a brand mentioned or how much current it draws. Spal is probably the best but I don't know if they offer any in 6 volts.
6v fan Speedway shows a 16" 6v fan on ebay but didn't find it listed on their website. He are some other 6volt fans from a place in Paso Robles.
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