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The SR is the only one that doesn’t have autopilot. I would assume that most of the people who order the SR don’t upgrade to autopilot since if they did they would almost be at the price of an SR+. Since autopilot is pure profit to Tesla they are likely willing to take a very skinny financing deal. So I could see why they would exclude the SR model. It’s too skinny for them.
Try posting the question in the SR/SR+ waiting room thread. There are 5,000 posts there from people who bought the SR/SR+ models. There is bound to be someone there who has tried to price match their rate.
I priced matched my rate with my SR+. I didn't have any issues, just sent the email with the required rate match documentation and they got back to me in 30 minutes telling me all was done.