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Just had mine replaced by the service center and they did a fine job. There is really no after market because they have to get the glass from tesla anyhow. Then the service center has to calibrate the cameras after replacement anyhow. It cost $932 through the service center. You can then make a claim with your insurance company so you'll get back everything above your deductable.
Ok..I've seen various posts about it requires Tesla to calibrate while others state it will self calibrate. Just wanted first hand knowledge/experience