$850 Shipped, NIB, from the Bay Area (CA).
Forgive the stock photo; I have not opened these at all! These are designed to replace the stock 335x20 rotors with larger 370x23mm rotors for better cooling and, of course, better looks! The factory caliper is retained; just remove the caliper and reinstall with the bracket and included hardware, and slide the new rotors in place of the factory ones. Because no fluid changes are involved, I’d venture this might be a 1-hour install.
Important...
NIB Paragon 370mm Rear BBK, Model 3 Performance
Forgive the stock photo; I have not opened these at all! These are designed to replace the stock 335x20 rotors with larger 370x23mm rotors for better cooling and, of course, better looks! The factory caliper is retained; just remove the caliper and reinstall with the bracket and included hardware, and slide the new rotors in place of the factory ones. Because no fluid changes are involved, I’d venture this might be a 1-hour install.
Important...
NIB Paragon 370mm Rear BBK, Model 3 Performance