I have done the Dwight Smith (Freightliner) modification on My '63 +4-4Str. It works, but not dramatic. However: I now have a Shroud around a engine driven plastic fan. The plastic fan blade is a universal unit that can be cut down and blades trimmed to reduce the noise. The shroud was designed by Bob Nogueira (Texas). Robert Couch helped me sort the Flex-A-Lite Plastic fan blade. If I could just figure out TM's picture system I would send more information. Flex-A-Lite has a Universal Electric Fan with a Plastic Shroud that will fit on the inside of a radiator. I have this on My '61 DHC. Win Mueling (A Canadian) who lives North of Me installed this on two +8's (1970 & 1986) with success (I hear).