The factory front brake rotors are crazy expensive 2 piece rotors that your local dealer would charge you $1000 to $1200 each! Even when you shop online for them they are $600 per rotor and GM keeps raising the cost and price. The 2 piece design has a removable center hat with hardware that bolts the center hat to the rotor disc ring. The hat is reusable, but GM and Brembo does not sell the replacement rings separate, so we decided to come up with replacment rings that are exactly the same quality with a better Zinc coated anti-Rust coating at a much more affordable price. This listing is for a pair quantity 2, replacment rotor rings. You simply take your old rotors and unbolt the center hat from your old rotors and bolt it back up to these new rings. Save yourself a lot of money. These have a better coating than the factory original ones. The 3rd or 4th picture in the listing shows a new factory rotor next to the ring so you can see what it looks like compared to the original one. It’s identical with a better coating. The internal vented disc is exactly the same design. This fits: 2016-19 Cadillac CTS-V 2017-20 Chevy Camaro ZL1 and ZL1 1LE These do not work for the Camaro SS 1LE These fit the 6 piston front Brembo Calipers. We specialize in all of the GM Brembo Calipers, rotors, and brakes. There is a lot of confusion on what fits what. I specialize and know all the compatibility and will guarantee they will be the correct setup for what vehicles I say it will fit. Many times I get customers frustrated from their local dealer ordering them the incorrect parts. Problem is they don’t know what they are doing. Even when you give them a vin number they would order you the wrong parts. When you buy from us you get what we advertise, quickly and at a great discounted price. This replaces the rotor with GM part #84271643 or AC Delco part # 177-1247 390.2 mm or 15.3″ Diameter 35.9 mm nominal thickness 34 mm discard thickness Sorry these are very heavy and is an overweight package which is why the shipping cost is so high. The package is over 70 lbs which is an extra charge through UPS and too heavy to even ship by USPS as they have a 70 lbs weight limit.