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Tesla came out with news this month that Canada can now edit their order and maintain old pricing. Although you may not be able to edit, your SA can do it for you.
https://driveteslacanada.ca/news/tesla-canada-edit-sign-maintain-pricing/
I had EDD on LR on May 18-June 01. With the recent Canada news about honouring old pricing, I contacted SA and went ahead with the change. Had to wait a day to be approved.