The Monterosport is built in Thailand and all the parts are sourced from Thailand; including engine, ecu, radiator, aircon and even the wheels all are made in Thailand. Why would the dealer say the replacements would come from Japan? Since the Monterosport is not a JDM-vehicle unlike the 09 Pajero or the Lancer Evo-X.

The cruel conspiracy is that they just might hold your unit off for the time being until they could justify that it needs to be written-off so they could get more money out of you by getting another montero from them with your insurance write-off.
I heard this is what happened to flooded BMW units they were completely written-off and the owners are forced to get new cars from them since BMW parts are really hard to come by and have prices which would be worth more than the actual car. You can actually see the flooded BMW units at their warehouse in Bicutan inside the KIA-Motors Compound.