Hook up for cab heaters, Yanmar 3T90J/John Deere tractor

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Hook up for cab heaters, Yanmar 3T90J/John Deere tractor

ZIPPY

I have a John Deere 950 Utility tractor, and I have a Custom 400 Metal cab I installed.
I have two heater cores in the overhead of cab, but cannot figure out where to tap in for the engine coolant to pump up to the heater cores.
People say to use the plug on the water pump. Arent any. They say I should tap the pump lines, but.... which ones, and how? There isnt any EXTRA room. Short hoses already.
Block threaded plugs are all too small to fit 5/8 hose.
Stumped. I know it came off a 950 utility tractor just like mine, but original owner doesnt remember where they were hooked up.

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