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I have a 2016 Lux that has these switches, but no crawl control yet! I wonder if the switches are interchangeable?
Switch is interchangeable. The correct switch part number for adding the crawl control (which replaced your DAC) is the part number ending 60070, NOT the 60080. The mentioned "white strip" is the back lighting on the switch which is the same as yours without crawl control. To enable crawl control, you will need replace the switch and perform the ECU calibration as described by Acrad at beginning of the thread. As many menders have done, it is a relatively simple and straight forward upgrade.
I think Matt@OEM said he had 6 orders just today and yesterday. Seems more and more people throwing option on their rig after seeing it can be easily added.