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Check http://scsfrigette.com/pdfs/rv/scs%2...me%20units.pdf for unit ID and part numbers.
I did mine last year and it was not very hard except for the tight access. It was all done from the outside. I did not have to remove the AC lines. To eliminate future coolant loss the next time the heater core fails I added two valves to make it possible to isolate the core.