I don't think Dodge has drilled rotors on Challengers or Chargers so I doubt they are OEM. There is a lot of discussion on this topic as I am in the same boat; $5,000 for front rotor replacement and all 4 pads at Dealer, no thank you. The OEM's are good and not as overpriced as you may think, check out online dealers, you can enter your cars specifications and get the correct rotors and pads, just have to choose what features you are looking for and how much you want to spend. Rotors can go for $1-5K each and higher but you can get good ones for much less. Some people don't like drilled rotors because the holes rust and look dingy. Black rotors fade and do not look good at all over time, but the edge and holes stay coated.
Try Americanmuscle.com for different rotors that aren't too expensive, you can get all four rotors for under $600. There are several other sites, any decent brake shop can do this change and may let you supply the parts. Pretty much anyone who can do basic mechanical work on their car can do this, as opposed to mounting a tire on a rim. Also helps to have friends that like to restore muscle cars.
PowerStop pads work on the Brembos, Evolution Z23's are carbon-fiber ceramic, they don't produce much dust, if any. Extreme Z26 are made for high speed braking and don't perform as well for daily driving. They are kind of mid range price but you can get some deals on the kits online. I'm thinking about getting Z23's for street use w/ MPS4S (Michelin Piolet Sport 4 All Seasons) for daily but still debating on pads for the track Mickey's.
Try searching the forum as there is so much good discussion that gets buried over time. Here is some info on the Power Stops, and this is just one manufacturer.
Power Stop Z23 vs Z26 -Which Brake Pad Upgrade Is Good for You? (toolsbible.com)
POWER STOP Evolution sport BRAKE PAD review.. - YouTube
This guy had some issues with them, explained "Peanut Butter" pads.
Power stop Z23 Evolution brake pad review - YouTube