Indeed the thought had struck me, the rub in the 443B install is that the "lower" hose is darn hard to get to, and darn angled. I"ve wondered if the plug screwed into the thermostat housing (below the thermostat I think...) might be an option if it is indeed below the thermostat. The 443B has a pump and pressurized system whereas I think the tractors are all thermosiphon? The radiator here is horizontal integral with the hydraulic oil exchanger, and mounted about a foot above the top of the block, and I could only get a heater in the upwards vertical portion, but it would be darn near at the level of the head by where I could get it in, and I don"t honestly have a feel for how that would work.
But they are easily available locally at least so it may be worth a try. I may get daring and whack out a couple core plugs and see what lies beneath though, I got some 30mm Nissan ones, so I shouldn"t be shooting myself in the foot too much.
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