Great information! I have an interesting proposal for swapping mirrors. My uncle has a 2017 GMC Sierra 2500 with DPN towing mirros (not sure what trim, but it does NOT have memory seats). I have a 2018 GMC Sierra 1500 Base model (one step above work truck trim) that has the DL8 mirrors. Neither truck is a diesel. We would like to swap mirrors with eachother and from what I can tell, the DL8 to DPN swap should be pretty straighforward, but wondering if anyone has expereince tiwht the DPN to DL8 "downgrade"? I'm mostly worried about any error codes that may come up or if I'll have to reprogram anything.