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Hello, Most of the switches still use the old method of having a thin nut threaded on the shaft of the switch to hold it to the dash. The trim is another matter and really I would try to go to a Salvage yard and remove this part from a wreck to see how it comes apart.
You can buy the switch all day long new. But you may break the moulding of the dash changing the part. Best to let broken parts happen on the junkyard car rather than your own.
The entire dash must be removed to access the heater core, this job requires at least 10 hours to do for a shop with the right tools and books, for the do it yourself about 15 hours if at all, I recommend you go to a qualified shop for this repair.