Steve--the industrial side panels are the same as the 70 standard panels (no hole in the side)  only the row crops had the hole in the side, for a cultivator support bracket. 
Panels are available from Richard Lynch, at Lynch Farms, Eaton, OH, or Steiner Tractor Parts in Holly, MI.  The radiator curtain was held on with wing nuts, and rolled up that way, when letting down, but pulled up with  a chain. There was not a 3 speed that I am aware of, but there was a 4 speed.  Shift pattern is the same as a 6 speed 70, minus 5th and 6th gear.  Most 4 speeds came out on steel, and many had 5th and 6th gears installed in the transmission, just blocked out of use.  The dash light did have a cover, check with Korves Oliver for a replacement light, or maybe a replacement cover.  I have a 70 industrial, as well as a 70 Cockshutt standard, and a 70 orchard.  Please feel free to call any time with questions.  I can be reached at 309-462-3635 most evenings.  Hope this helps, Terry.